It arises medially from the infraspinous fossa of the scapula, specifically from fleshy fibers from its medial two-thirds, and by tendinous fibers from the ridges on its surface; it also arises from the infraspinatous fascia which covers it, and separates it from the teres major and minor muscles. This category only includes cookies that ensures basic functionalities and security features of the website. Don't hesitate to suggest a correction, translation or content improvement. - Symptoms, Causes & Treatment, Frontal Sinus Trephination: Definition & Purpose, Non-Placental Mammals: Definitions, Characteristics & Examples. You can find your infraspinatus muscle at the back of your shoulder. – IMAIOS is a company which aims to assist and train human and animal practitioners. Interglaciation: Definition & Explanation on the Interglacial Period, What is an Ecological Footprint? The infraspinatus muscle is a component of the rotator cuff; the latissimus dorsi muscle is the largest muscle of the back. This video explains the anatomy of the infraspinatus muscle, one of the 4 rotator cuff muscles: origin, insertion and actions. Together with the supraspinatus, teres minor and subscapularis, the infraspinatus muscle is . Supraspinatus receives arterial supply from the suprascapular artery, a branch of the thyrocervical trunk of subclavian artery. These muscles are not considered very morphologically variable. Author: Scott A. Sheffield MS . Reading time: 5 minutes. transosseous fixation), depending on the severity of the rupture and the patient’s age. It is part of the rotator cuff muscle group. Standring, S. (2008). Learn the main muscles of the rotator cuff with the following quiz. Shoulder injuries usually result from repetitive strain rather than sudden movements, but sudden impacts may also cause tears. It acts with teres minor to externally rotate the glenohumeral joint, and with other rotator cuff muscles to stabilize the shoulder. Copyright © Supraspinatus muscle (Musculus supraspinatus) - Yousun Koh. Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. You can freely give, refuse or withdraw your consent at any time by accessing our cookie settings tool. 4,6,10,11,19 Furthermore, the optimal shoulder position to specifically strengthen the infraspinatus muscle is controversial. Supraspinatus is innervated by the suprascapular nerve, formed by the anterior rami of spinal nerves C5 and C6. If you have active trigger points in your infraspinatus, it can cause pain in your shoulder and down your arm. Kim Bengochea, Regis University, Denver. It's attached to the top of your upper arm bone (humerus) and your shoulder blade (scapula). Get instant access to this gallery, plus: Introduction to the musculoskeletal system, Nerves, vessels and lymphatics of the abdomen, Nerves, vessels and lymphatics of the pelvis, Infratemporal region and pterygopalatine fossa, Meninges, ventricular system and subarachnoid space. However, the latissimus dorsi has more frequent variations than the infraspinatus. When you visit IMAIOS, cookies are stored on your browser. All rights reserved. News, opinions & thoughts of anatomy, medical imaging. – “I would honestly say that Kenhub cut my study time in half.” (2008) ISBN: 9780443066849 -, 2. Cookies allow us to analyze and store information such as the characteristics of your device as well as certain personal data (e.g., IP addresses, navigation, usage or geolocation data, unique identifiers). 1/4 Synonyms: none Supraspinatus is the most superior of the four rotator cuff muscles. Action: Outward rotator and abductor of the humerus and a flexor or extensor of the shoulder joint, depending on the position of the joint when the muscle contracts. The subscapularis muscle is very important for the internal rotation of the humerus. Reading time: 3 minutes. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. This muscle is one of the four muscles that form the rotator cuff, which functions to stabilize the shoulder joint. The Infraspinatus muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, teres minor and subscapularis. Infraspinatus Description A thick, triangular muscle; one of the 4 muscles which comprise the Rotator Cuff of the shoulder. It originates in the infraspinatous fossa of the scapula and inserts on the greater tubercle of the humerus. Researchers have reported varying results of selective infraspinatus muscle strengthening, depending on the exercise and shoulder-joint position. The cervical nerves are nerves that originate from the neck region of the spinal cord. In this video tutorial we will go over the most important anatomy facts of the infraspinatus muscle, its origin, insertion and functions: - 0:11 anatomy of the rotator cuff- 0:35 infraspinatus muscle origin and insertion- 0:51 functions of the rotator cuff- 1:16 functions of the infraspinatus muscleWant to test your knowledge on the rotator cuff muscles? Underlying structures: There are no anatomical children for this anatomical part. You can email the site owner to let them know you were blocked. Infraspinatus is a thick triangular muscle that occupies the majority of the dorsal surface of the scapula. All rights reserved. - Definition & Actions, Supraspinatus Muscle: Definition, Function & Innervation, Supraspinatus Muscle: Action, Origin & Insertion, Infraspinatus Muscle: Definition, Function & Innervation, Teres Minor Muscle: Action, Origin & Insertion, Teres Minor Muscle: Definition, Function & Innervation, Subscapularis Muscle: Definition, Function & Innervation, Subscapularis Muscle: Action, Origin & Insertion, Muscle Dysfunction in the Head, Neck & Shoulders, High School Physical Science: Help and Review, Middle School Physical Science: Help and Review, Middle School Physical Science: Tutoring Solution, Middle School Physical Science: Homework Help Resource, NY Regents Exam - Chemistry: Tutoring Solution, NY Regents Exam - Earth Science: Help and Review, NY Regents Exam - Earth Science: Tutoring Solution, NY Regents Exam - Living Environment: Tutoring Solution, NY Regents Exam - Physics: Help and Review, External Carotid Artery: Anatomy & Branches, Antibiotic Resistant Bacteria: Evolution & Examples, What Is Lymphedema? All rights reserved. After passing over the glenohumeral joint it inserts onto the superior facet on the greater tubercle of humerus. It is a small triangular-shaped muscle, located on the posterior aspect of the scapula. Description: The Infraspinatus is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa; it arises by fleshy fibers from its medial two-thirds, and by tendinous fibers from the ridges on its surface; it also arises from the infraspinatous fascia which covers it, and separates it from the Teretes major and minor. To unlock this lesson you must be a Study.com Member. RCRSP Online Course here: https://study.physiotutors.com/course/rotator-cuff-related-shoulder-pain/GET OUR ASSESSMENT BOOK ︎ ︎ http://bit.ly/GETPT ︎ ︎OUR A. This lesson will define this important shoulder muscle and describe its function and innervation. and grab your free ultimate anatomy study guide! 2023 The following article describes the anatomy, including the origins and insertions, together with the function and pathologies of the rotator cuff. Download yours today: https://khub.me/thr4kThe infraspinatus muscle belongs to the group of the rotator cuff muscles together with the supraspinatus, subscapularis and teres minor muscles. Trigger points are usually activated by stress on the muscle. The main functions of the infraspinatus muscle include: I would definitely recommend Study.com to my colleagues. The action you just performed triggered the security solution. The starting position (left) and the finished position (right). Reviewer: Do not hesitate to suggest a correction, we will examine it carefully. These muscles all originate from the scapula and insert in the humerus. Start Now. The information we provide is grounded on academic literature and peer-reviewed research. Supraspinatus muscle: want to learn more about it? Test yourself with our rotator. origin: infraspinous fossa of the scapula insertion: middle facet of the greater tubercle of the humerus innervation: suprascapular nerve (C5-6) Enrolling in a course lets you earn progress by passing quizzes and exams. Dan has taught college Nutrition, Anatomy, and Medical Terminology courses. Your rotator cuff: Stabilizes the head of the humerus in the shoulder joint. Additionally, it assists in the abduction of the arm. If you do not consent to the use of these technologies, we will consider that you also object to any cookie storage based on legitimate interest. Click on a category of cookies to activate or deactivate it. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. Have you ever seen a hitchhiker on the side of the road with their arm rotated externally out to their side and their thumb sticking straight up? Kenhub. Last reviewed: June 09, 2022 During anatomical dissection, an additional muscle structure was found. The fourth muscle of the rotator cuff is the infraspinatous fossa of the scapula and inserts on the The rotator cuff muscles are a favourite exam topic! Your infraspinatus muscle is a thick triangular muscle located at the back of your shoulder. Make the changes yourself here! The rotator cuff functions to stabilize the shoulder joint. The rotator cuff helps hold the head of the humerus in contact with the glenoid cavity (fossa, socket) of the scapula during movements of the shoulder, thus helping to prevent dislocation of the joint. It’s like a teacher waved a magic wand and did the work for me. © copyright 2003-2023 Study.com. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. Benninghoff/Drenckhahn: Anatomie, Band 1, 16. All other trademarks and copyrights are the property of their respective owners. Some of the most common injuries and conditions that affect the infraspinatus muscle include: Rotator cuff tear: This is one of the most common rotator cuff injuries that can result from a traumatic event or degeneration of the rotator cuff muscles over time. Conversely, the teres minor muscle’s function consists primarily of external rotation and adduction of the arm. Supraspinatus is one of the rotator cuff muscles, along with infraspinatus, teres minor and subscapularis muscles. Supraspinatus lies deep to the trapezius muscle and superior to the spine of the scapula and infraspinatus muscle. The fibers converge to a tendon, which glides over the lateral border of the spine of the scapula, and, passing across the posterior part of the capsule of the shoulder-joint, is inserted into the middle impression on the greater tubercle of the humerus. Summary origin: subscapular fossa of the scapula insertion: l esser tubercle of the humerus some fibers also extend to the greater tubercle and bicipital groove The infraspinatus is a skeletal muscle located beneath the scapular spine of the posterior shoulder. Referred pain is pain in other areas of the body, usually ones near the trigger point. In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. • Your feedback helps us to improve the content. Your feedback helps us to improve the content. This data is processed for the following purposes: analysis and improvement of the user experience and/or our content offering, products and services, audience measurement and analysis, interaction with social networks, display of personalized content, performance measurement and content appeal. Last update: Oct 6th, 2022. This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/). The tendon of supraspinatus is separated from the coracoacromial ligament, the acromion and the deltoid muscle by the subacromial bursa. It is the infraspinatus muscle, one of the many muscles that make up the shoulder joint. It then wraps around the lateral proximal humerus to attach to the middle facet of the greater tubercle. Take this quiz: https://khub.me/qkhxjRead more on the movements and muscles of the arm in our free article, in order to finish with this topic and become a master of the anatomy of the upper extremity: https://khub.me/ta4zwFor more engaging video tutorials, interactive quizzes, articles and an atlas of Human anatomy and histology, go to https://khub.me/22qnj The arterial blood supply to the infraspinatus muscle is primarily provided by the suprascapular and circumflex scapular arteries. Dr. Christopher A. Becker The infraspinatus muscle originates from the infraspinous fossa located on the posterior surface of the scapula. At the time the article was created Jeremy Jones had no recorded disclosures. It is part of the rotator cuff muscle group. Illustrated Veterinary Anatomical Nomenclature - 3rd edittion - Gheorghe M. Constantinescu, Oskar Schaller - Enke, News, opinions & thoughts of anatomy, medical imaging, Infraspinatus muscle - Muscle attachments. Atlas of Human Anatomy, 6th Edition, Elsevier Saunders. Together with the supraspinatus, teres minor and subscapularis, the infraspinatus muscle is classified as one of the rotator cuff muscles that provide stability to the shoulder joint. Copyright © It arises mostly from the infraspinous fossa of scapula, and connects it to the proximal humerus . It's one of the rotator cuff muscles providing the mechanical link between the posterosuperior and . Abducts (elevates) the shoulder joint out to the side. Muscle Energy Technique - Infraspinatus - YouTube Stuart Hinds presents a brief overview of how muscle energy technique (MET) may be applied to the infraspinatus muscle of the. The infraspinatus gets its name because this muscle is located in the infraspinous fossa of the scapula. The main function of the rotator cuff is to in the joint socket, the glenoid cavity. Kenhub. Once you've finished editing, click 'Submit for Review', and your changes will be reviewed by our team before publishing on the site. It originates from the back of the shoulder blade (scapula) and attaches to the back of the upper arm (humerus). Even though the rotator cuff consists only of four muscles, it plays an essential role in the stability and mobility of the most flexible joint in the human body: the shoulder.The infraspinatus muscle is a strong external rotator of the arm and additionally assists in both abduction and adduction. Don't hesitate to suggest a correction, translation or content improvement. Niamh Gorman MSc joint instability, physiotherapy in past 3 months, systemic disorders, anti-inflammatory/ Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Its function is related to the glenohumeral joint, where the muscles of the cuff function both as the executors of the movements of the joint and the stabilization of the joint as well. This website is using a security service to protect itself from online attacks. Rotator cuff muscles dysfunction leads to shoulder impingement as the head of the humorous superiorly migrates during arm elevation. Venous drainage is conveyed by the same-named veins which accompany the arteries and drain into the subclavian vein. Infraspinatus muscle. It is mandatory to procure user consent prior to running these cookies on your website. Specifically, the infraspinatus functions to keep the head of the humerus in its correct position against the scapula while the humerus is moved throughout the shoulder joint. During movements of the glenohumeral joint, the supraspinatus muscle participates in the stabilization of the head of humerus in the joint. • Last, R. J., McMinn, R. M. H.. Last's Anatomy, Regional and Applied. The infraspinatus is innervated by the suprascapular nerve that arises from the fifth and sixth cervical (C5, C6) nerve roots of the brachial plexus. To find out more, read our privacy policy. The supraspinatus muscle, the most superiorly located of the rotator cuff muscles, resides in the supraspinous fossa of the scapula, superior to the scapular spine. We created the ★ Ultimate Anatomy Study Guide ★ to help you kick some gluteus maximus in any topic. We also use third-party cookies that help us analyze and understand how you use this website. Author: 147.135.128.179 Supraspinatus sometimes receives a collateral blood supply via the dorsal scapular artery. You can consent to the use of these technologies by clicking "accept all cookies". Last reviewed: December 05, 2022 infraspinatus: [TA] intrinsic (scapulohumeral) muscle of shoulder joint, the tendon of which contributes to the formation of the rotator cuff; origin , infraspinous fossa of scapula; insertion , middle facet of greater tubercle of humerus; action , extends arm and rotates it laterally; its tonic contraction helps to hold the head of the . All the muscles mentioned above fulfill different functions. He is a Registered Dietitian (RD) and a Certified Exercise Physiologist (EP-C). [1] in Exercise Physiology from Furman University and a M.S. Roberto Grujičić MD The rotator cuff tear is an example of a traumatic lesion of the rotator cuff where it comes to a rupture of one or more tendons up to the point of a complete tear of the rotator cuff muscles. The Infraspinatus muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, teres minor and subscapularis. All rights reserved. As the infraspinatus acts at the shoulder joint, it belongs to the muscles of the shoulder girdle. The infraspinatus muscle stabilizes the glenohumeral (shoulder) joint and provides external (lateral) rotation of the arm. You also have the option to opt-out of these cookies. IMAIOS and selected third parties, use cookies or similar technologies, in particular for audience measurement. Infraspinatus Muscle - Attachments, Actions & Innervation. The infraspinatus muscle receives electrical impulses from the brain through the suprascapular nerve. 192 lessons. These cookies are used to measure audience: it allows to generate usage statistics useful for the improvement of the website. The infraspinatus (L. infra, below ; spinus, spine [of scapula]) is a thick rotator cuff muscle covering the majority of the posterior surface of the shoulder blade below the scapular spine. Continue reading to understand the aspects of this muscle in detail. Origin The infraspinatus fossa of scapula, with some fibres arising from the infraspinatous fascia which covers the muscle and separates it from Teres Major and Teres Minor. The tendon of this muscle is sometimes separated from the capsule of the shoulder joint by a bursa, which may communicate with the joint cavity. It originates from the medial aspect of the supraspinous fossa, a concave depression located above the spine of the scapula. All content published on Kenhub is reviewed by medical and anatomy experts. We use cookies to improve your experience on our site and to show you relevant advertising. Register now Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. It originates in the infraspinatous fossa of the scapula and inserts on the greater tubercle as well. For questions regarding business inquiries. Quiz Course 4K views What is the Infraspinatus Muscle? ]: Orthopädie und Unfallchirurgie, 19. The infraspinatus muscle is one of the rotator cuff muscles. The rotator cuff muscles are a favourite exam topic! The infraspinous fossa is the concave surface at the back of the scapula. This process is commonly caused by a thickened tendon or an inflammation of the overlying bursa leading to an enlargement, thus compressing the subacromial space. Each rotator cuff muscle performs a specific, important job that helps your shoulder joint work. The subscapularis muscle is a powerful internal rotator which also supports the arm during abduction and adduction. These cookies will be stored in your browser only with your consent. Read more. anesthetic injections. Finally, the infraspinatus muscle is a strong external rotator and additionally assists in both abduction and adduction. This article will discuss the anatomy and function of supraspinatus muscle. Learn more about the supraspinatus and other muscles of the rotator cuff with the following quiz. As the infraspinatus acts at the shoulder joint, it belongs to the muscles of the shoulder girdle. What is In Vitro Fertilization and How Does It Work? All content published on Kenhub is reviewed by medical and anatomy experts. At the time the article was last revised Tae Gon Yoo had no recorded disclosures. The infraspinatus is a muscle in the shoulder and is one of the four muscles which comprise the rotator cuff. Make sure you're prepared for questions on its attachments, innervations and functions with our upper extremity muscle anatomy revision chart. The infraspinatus muscle is a triangular-shaped muscle that is located at the back of the shoulder joint, on the back surface of the. This data is processed for the following purposes: analysis and improvement of the user experience and/or our content offering, products and services, audience measurement and analysis, interaction with social networks, display of personalized content, performance measurement and content appeal. Serving healthcare professionals through interactive anatomy atlases, medical imaging, collaborative database of clinical cases, online courses... © 2008-2023 IMAIOS SAS All rights reserved. Attachments: Originates from the infraspinous fossa of the scapula and attaches to the greater tubercle of the humerus. The medical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes. The infraspinatus (Latin: musculus infraspinatus) is a flat triangular-shaped muscle of the upper limb. It originated on the medial border of the scapula . You can consent to the use of these technologies by clicking "accept all cookies". The infraspinatus muscle originates from the infraspinous fossa of the posterior scapula. Gray’s Anatomy for Students, 3rd Edition, Churchill Livingston Elsevier. Read more. The infraspinatus gets its name because this muscle is located in the infraspinous fossa, a concave surface at the back of the scapula. Anatomy Next © 2023. Anatomy The infraspinatus is a thick triangular muscle in the upper back. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The infraspinatus is a thick and triangular muscle. If you do not agree to the foregoing terms and conditions, you should not enter this site. - Definition & Function, Where is the Deltoid Muscle? Shoulder joint stabilization, external rotation of arm, Suprascapular and circumflex scapular arteries. tus ˌin-frə-spī-ˈnāt-əs. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. The. Please contact. Found an error? For more information, see our privacy policy. Cloudflare Ray ID: 7d3288b3480a3d13 You can freely give, refuse or withdraw your consent at any time by accessing our cookie settings tool. The muscle fibers converge onto a tendon that runs inferior to the acromion of the scapula. “I would honestly say that Kenhub cut my study time in half.” The infraspinatus muscle occupies the infraspinous fossa, and crosses the lateral part of shoulder joint ot the roughened area of the greater tubercle of humerus. • Innervation: Suprascapular nerve. After supplying fibers to the supraspinatus muscle, it supplies articular branches to the capsule of the shoulder joint. Get instant access to this gallery, plus: Introduction to the musculoskeletal system, Nerves, vessels and lymphatics of the abdomen, Nerves, vessels and lymphatics of the pelvis, Infratemporal region and pterygopalatine fossa, Meninges, ventricular system and subarachnoid space, Shoulder joint: abduction of arm, stabilization of the humeral head in the glenoid cavity. The supraspinatus muscle initiates the abduction of the of the arm. It attaches to the top of the humerus (long bone of the upper arm). To benefit from all the features, it’s recommended to keep the different cookie categories activated. IMAIOS and selected third parties, use cookies or similar technologies, in particular for audience measurement. It is innervated by the subscapular nerve. The infraspinatus muscle plays a very important role in the mobility and stability of the shoulder joint. Auflage, Urban & Fischer Verlag (2003), Berchtold: Chirurgie, 6. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. A positive Neer sign when elevating the shoulder above 120 degrees is characteristic in the impingement syndrome. For the full series of shoulder examination tutorials, visit the AMBOSS Library: https://go.amboss.com/OrthoShoulderExamThe infraspinatus muscle is one of four main muscles of the rotator cuff that stablizes the shoulder joint and its primary function is to externally rotate the upper arm. The suprascapular nerve is a nerve that consists of nerve fibers from the fifth and sixth cervical nerve (C5 and C6). Infrapinatus muscle is often involved in shoulder pathologies as shoulder impingement and rotator cuff tears. The infraspinatus muscle is a triangular-shaped muscle that is located at the back of the shoulder joint, on the back surface of the scapula (shoulder blade). Susan Standring. Supraspinatus is the most superior of the four rotator cuff muscles. It. When you visit IMAIOS, cookies are stored on your browser. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. Necessary cookies are absolutely essential for the website to function properly. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles all work together to keep the joint stable. and grab your free ultimate anatomy study guide! : a muscle that occupies the chief part of the infraspinous fossa of the scapula, is inserted into the greater tubercle of the humerus, and rotates the arm laterally. The infraspinatus and rotator cuff muscles help stabilise your shoulder and help move your arm smoothly. The infraspinatus muscle is a triangular-shaped muscle that is located at the back of the shoulder joint, on the back surface of the scapula, attaching to the top of the humerus. Author: Create your account. It also assists the deltoid muscle in abduction of the arm at the glenohumeral joint. [Hrsg. Here are two examples: An example of a degenerative disease of the rotator cuff is the subacromial impingement syndrome. The infraspinatus is susceptible to various injuries and conditions that can cause pain, weakness, and reduced range of motion. Check for errors and try again. There the supraspinatus muscle tendon gets impinged at the acromion. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. Dimitrios Mytilinaios MD, PhD Essential Clinical Anatomy, 5th Edition, Wolters Kluwer. Read more. The tendon of the muscle extends laterally, passing under the acromion process and over the head of the humerus, blending into the glenohumeral joint capsule to insert onto the superior facet of the greater tuberosity of the . The subscapularis muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, infraspinatus and teres minor. ADVERTISEMENT: Supporters see fewer/no ads. This muscle is one of the four muscles that make up the rotator cuff. Moore, K.L., Agur, A.M.R., Dalley, A.F. Imprint them into your brain easily using the following mnemonic. The infraspinatus is an intrinsic muscle of the shoulder region. Click on a category of cookies to activate or deactivate it. Kim Bengochea, Regis University, Denver. Even though the rotator cuff consists only of four muscles, it plays an essential role in the stability and mobility of the most flexible joint in the human body: the shoulder. Injuries of the rotator cuff interfere with the function of the glenohumeral joint and correspond with inability to perform the movements associated with this joint. Origin: Infraspinous fossa, scapular spine and the caudal border of the scapula. These cookies are used to measure audience: it allows to generate usage statistics useful for the improvement of the website. • Serving healthcare professionals through interactive anatomy atlases, medical imaging, collaborative database of clinical cases, online courses... © 2008-2023 IMAIOS SAS All rights reserved. Test yourself with our rotator cuff quiz on https://khub.me/qkhxjOh, are you struggling with learning anatomy? It extends between the scapula and humerus. This website uses cookies to improve your experience while you navigate through the website. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. The elbows can either be at the patient's side or abducted 90 degrees to further isolate the infraspinatus from the deltoid muscle. Fig 1 – The rotator cuff muscles, which act to stabilise the shoulder joint. The infraspinatus (Latin: musculus infraspinatus) is a flat triangular-shaped muscle of the upper limb. Is our article missing some key information? Another possible cause for an impingement is a bony subacromial spur resulting in a narrowing of the nerve with pain.
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