Infraspinatus is a thick triangular muscle that occupies the majority of the dorsal surface of the scapula. IMAIOS is a company which aims to assist and train human and animal practitioners. This lesson will define this important shoulder muscle and describe its function and innervation. These cookies do not store any personal information. 147.135.128.179 For questions regarding business inquiries. Auflage, Elsevier Verlag (2008), Rössler H., Rüther W. 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. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles all work together to keep the joint stable. Kim Bengochea, Regis University, Denver. Keith L. Moore, Arthur F. Dalley, A. M. R. Agur. Attachments: Originates from the infraspinous fossa of the scapula and attaches to the greater tubercle of the humerus. The infraspinatus and rotator cuff muscles help stabilise your shoulder and help move your arm smoothly. Don't hesitate to suggest a correction, translation or content improvement. To benefit from all the features, it’s recommended to keep the different cookie categories activated. The. Finally, the infraspinatus muscle is a strong external rotator and additionally assists in both abduction and adduction. It arises mostly from the infraspinous fossa of scapula, and connects it to the proximal humerus . Suprascapular nerve damage causes shoulder weakness and muscle loss (atrophy). The infraspinatus is susceptible to various injuries and conditions that can cause pain, weakness, and reduced range of motion. Infraspinatus is one of the four rotator cuff muscles, alongside subscapularis, teres minor and supraspinatus muscles. It is a small triangular-shaped muscle, located on the posterior aspect of the scapula. The suprascapular nerve (C5, C6) powers the infraspinatus muscle. Origin: Infraspinous fossa, scapular spine and the caudal border of the scapula. The website cannot function properly without these cookies, which is why they are not subject to your consent. Venous drainage is conveyed by the same-named veins which accompany the arteries and drain into the subclavian vein. Susan Standring. The infraspinatus is a thick and triangular muscle. At the time the article was created Jeremy Jones had no recorded disclosures. Structure [ edit] The subscapularis muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, infraspinatus and teres minor. The main function of the rotator cuff is to stabilize and center the humeral head in the joint socket, the glenoid cavity. It works in tandem with the three other portions of the rotator cuff so as to stabilize and rotate the arms during dynamic movement. IMAIOS is a company which aims to assist and train human and animal practitioners. The infraspinatus muscle plays a very important role in the mobility and stability of the shoulder joint. ADVERTISEMENT: Supporters see fewer/no ads. 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. [Hrsg. The supraspinatus muscle initiates the abduction of the of the arm. The infraspinous fossa is the concave surface at the back of the scapula. It is the infraspinatus muscle, one of the many muscles that make up the shoulder joint. Create an account to start this course today. If you have active trigger points in your infraspinatus, it can cause pain in your shoulder and down your arm. Some of them require your consent. Performance & security by Cloudflare. When looking at pathologies of the rotator cuff – as in all joints - one needs to differentiate between degenerative and traumatic lesions. You also have the option to opt-out of these cookies. If you do not agree to the foregoing terms and conditions, you should not enter this site. It is part of the rotator cuff muscle group. Anatomy Next © 2023. Last update: Oct 6th, 2022. [1] As one of the four muscles of the rotator cuff, the main function of the infraspinatus is to externally rotate the humerus and stabilize the shoulder joint. These muscles all originate from the scapula and insert in the humerus. The infraspinatus is a muscle in the shoulder and is one of the four muscles which comprise the rotator cuff. The infraspinatus muscle originates from the infraspinous fossa located on the posterior surface of the scapula. Make the changes yourself here! Last, R. J., McMinn, R. M. H.. Last's Anatomy, Regional and Applied. Create your account. The infraspinatus muscle stabilizes the glenohumeral (shoulder) joint and provides external (lateral) rotation of the arm. You can email the site owner to let them know you were blocked. The Infraspinatus muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, teres minor and subscapularis. 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. However, the latissimus dorsi has more frequent variations than the infraspinatus. 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. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. and grab your free ultimate anatomy study guide! in Dietetics & Nutrition from Florida International University. The supraspinatus muscle has its origin in the supraspinatous fossa and inserts on the greater tubercle of the humerus – similar to the teres minor muscle. [1] Insertion Niamh Gorman MSc The infraspinatus (Latin: musculus infraspinatus) is a flat triangular-shaped muscle of the upper limb. The infraspinatus muscle is a moderately-sized, triangle-shaped muscle found in the shoulder-blade region of the body. Articles talking about IMAIOS and its products, Get help with your subscription, account and more, Insertion: Middle facet of greater tubercle of the humerus, Artery: Suprascapular and circumflex scapular arteries, Action: Lateral rotation of arm and Adduction of arm and stabilizeshumerus, Antagonist: Subscapularis, pectoralis major, and latissimus dorsi. We use cookies to improve your experience on our site and to show you relevant advertising. The suprascapular nerve is a nerve that consists of nerve fibers from the fifth and sixth cervical nerve (C5 and C6). Author: Scott A. Sheffield MS . Kim Bengochea, Regis University, Denver. (2015). Imprint them into your brain easily using the following mnemonic. Abducts (elevates) the shoulder joint out to the side. Moore, K.L., Agur, A.M.R., Dalley, A.F. This muscle is one of the four muscles that make up the rotator cuff. Supraspinatus is innervated by the suprascapular nerve, formed by the anterior rami of spinal nerves C5 and C6. As the infraspinatus acts at the shoulder joint, it belongs to the muscles of the shoulder girdle. 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 facet of the greater tubercle of the humerus. This category only includes cookies that ensures basic functionalities and security features of the website. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. For the full series of shoulder examination tutorials, visit the AMBOSS Library: https://go.amboss.com/OrthoShoulderExamThe infraspinatus muscle is one of fo. Supraspinatus is one of the rotator cuff muscles, along with infraspinatus, teres minor and subscapularis muscles. 19 chapters | All other trademarks and copyrights are the property of their respective owners. “I would honestly say that Kenhub cut my study time in half.” Imprint them into your brain easily using the following mnemonic. The following article describes the anatomy, including the origins and insertions, together with the function and pathologies of the rotator cuff. Here are two examples: An example of a degenerative disease of the rotator cuff is the subacromial impingement syndrome. All rights reserved. The infraspinatus gets its name because this muscle is located in the infraspinous fossa of the scapula. Reviewer: The information we provide is grounded on academic literature and peer-reviewed research. • Read more. The infraspinatus (Latin: musculus infraspinatus) is a flat triangular-shaped muscle of the upper limb. Shoulder joint stabilization, external rotation of arm, Suprascapular and circumflex scapular arteries. [1] It originates from the medial aspect of the supraspinous fossa, a concave depression located above the spine of the scapula. Fig 1 – The rotator cuff muscles, which act to stabilise the shoulder joint. 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. Hawkins-Kennedy tests and Neer sign were positive in patients and infraspinatus muscle had at least one trigger point with referral pain pattern History of upper limb surgery or injections, glenohumeral. It's attached to the top of your upper arm bone (humerus) and your shoulder blade (scapula). General terms Body parts Regions of the body Osteology Arthrology Myology Cutaneous muscles Bursae and synovial sheaths Muscles of the head Muscles of neck Muscles of back Muscles of thorax Muscles of abdomen Muscles of the tail [coccygeal] Muscles of the thoracic limb Deltoid muscle Supraspinatus muscle Infraspinatus muscle Teres minor muscle 1/4 Synonyms: none Supraspinatus is the most superior of the four rotator cuff muscles. Text by Antoine Micheau, MD - Copyright IMAIOS 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. Atlas of Human Anatomy, 6th Edition, Elsevier Saunders. Essential Clinical Anatomy, 5th Edition, Wolters Kluwer. • Continue reading to understand the aspects of this muscle in detail. It originated on the medial border of the scapula . The infraspinatus muscle is member of the rotator cuff group, which comprises the supraspinatus, infraspinatus, teres minor, and subscapularis. In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. 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. In addition, the muscles tighten the joint capsule preventing a pinch during shoulder movements. 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.
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