It then wraps around the lateral proximal humerus to attach to the middle facet of the greater tubercle. Completely free. The infraspinatus is a muscle in the shoulder and is one of the four muscles which comprise the rotator cuff. Your infraspinatus is in the back of your shoulder. [1] Interglaciation: Definition & Explanation on the Interglacial Period, What is an Ecological Footprint? A positive Neer sign when elevating the shoulder above 120 degrees is characteristic in the impingement syndrome. Clinically Oriented Anatomy. The main functions of the infraspinatus muscle include: I would definitely recommend Study.com to my colleagues. Last reviewed: December 05, 2022 Make sure you're prepared for questions on its attachments, innervations and functions with our upper extremity muscle anatomy revision chart. It originates in the infraspinatous fossa of the scapula and inserts on the greater tubercle of the humerus. Click on a category of cookies to activate or deactivate it. Each rotator cuff muscle performs a specific, important job that helps your shoulder joint work. Muscles of the Body for Health Professionals, Infraspinatus Muscle: Action, Insertion & Origin, Psychological Research & Experimental Design, All Teacher Certification Test Prep Courses, Trapezius Muscle: Insertion, Origin & Action, Trapezius Muscle: Function, Location & Innervation, What Does the Deltoid Muscle Do? Your feedback helps us to improve the content. You also have the option to opt-out of these cookies. Learn anatomy faster and remember everything you learn. However, the latissimus dorsi has more frequent variations than the infraspinatus. 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. For questions regarding business inquiries. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. Copyright © Necessary cookies are absolutely essential for the website to function properly. 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? This information is intended for medical education, and does not create any doctor-patient relationship, and should not be used as a substitute for professional diagnosis and treatment. The following article describes the anatomy, including the origins and insertions, together with the function and pathologies of the rotator cuff. Start Now. Read more. The Infraspinatus muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, teres minor and subscapularis. 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. The main function of the rotator cuff is to in the joint socket, the glenoid cavity. - Definition & Function, Where is the Deltoid Muscle? Author: Venous drainage is conveyed by the same-named veins which accompany the arteries and drain into the subclavian vein. The infraspinatus muscle is member of the rotator cuff group, which comprises the supraspinatus, infraspinatus, teres minor, and subscapularis. Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. Test yourself with our rotator. © copyright 2003-2023 Study.com. plural infraspinati -ˈnā-ˌtī. Some of them require your consent. These are cookies that ensure the proper functioning of the website and allow its optimization (detect browsing problems, connect to your IMAIOS account, online payments, debugging and website security). Supraspinatus is the most superior of the four rotator cuff muscles. All rights reserved. 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. Roberto Grujičić MD Auflage, Elsevier Verlag (2008), Rössler H., Rüther W. The infraspinatus muscle receives electrical impulses from the brain through the suprascapular nerve. Infraspinatus Muscle - Attachments, Actions & Innervation. Referred pain is pain in other areas of the body, usually ones near the trigger point. 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 It arises from the subscapular fossa and inserts on the lesser tubercle of the humerus. [Hrsg. The suprascapular nerve is a nerve that consists of nerve fibers from the fifth and sixth cervical nerve (C5 and C6). In the human body, the rotator cuff is a functional anatomical unit located in the upper extremity. Test yourself with our rotator cuff quiz on https://khub.me/qkhxjOh, are you struggling with learning anatomy? 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. Remember to test active and passive range of motion, as well as strength against resistance!Subscribe to AMBOSS YouTube for the latest clinical examination videos, medical student interviews, study tips and tricks, and live webinars!Free 5-Day Trial: https://go.amboss.com/amboss-YTInstagram: https://www.instagram.com/amboss_med/Facebook: https://www.facebook.com/AMBOSS.Med/Twitter: https://twitter.com/ambossmedBlog: https://blog.amboss.com/us#AMBOSSMed #MedicalSchool #USMLE All content published on Kenhub is reviewed by medical and anatomy experts. We created the ★ Ultimate Anatomy Study Guide ★ to help you kick some gluteus maximus in any topic. Insertion: Distal to the greater tubercle of the humerus. Serving healthcare professionals through interactive anatomy atlases, medical imaging, collaborative database of clinical cases, online courses... © 2008-2023 IMAIOS SAS All rights reserved. Create your account. The Infraspinatus muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, teres minor and subscapularis. Register now Illustrated Veterinary Anatomical Nomenclature - 3rd edittion - Gheorghe M. Constantinescu, Oskar Schaller - Enke, News, opinions & thoughts of anatomy, medical imaging, Infraspinatus muscle - Muscle attachments. Infraspinatus Description A thick, triangular muscle; one of the 4 muscles which comprise the Rotator Cuff of the shoulder. Unable to process the form. Kenhub. The infraspinatus (Latin: musculus infraspinatus) is a flat triangular-shaped muscle of the upper limb. He has a B.S. Gray’s Anatomy for Students, 3rd Edition, Churchill Livingston Elsevier. It arises mostly from the infraspinous fossa of scapula, and connects it to the proximal humerus . It. 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. Imprint them into your brain easily using the following mnemonic. Infraspinatus is one of the four rotator cuff muscles, alongside subscapularis, teres minor and supraspinatus muscles. Your infraspinatus muscle is a thick triangular muscle located at the back of your shoulder. Register now Last, R. J., McMinn, R. M. H.. Last's Anatomy, Regional and Applied. Niamh Gorman MSc Revisions: 4. Shoulder injuries usually result from repetitive strain rather than sudden movements, but sudden impacts may also cause tears. It is the infraspinatus muscle, one of the many muscles that make up the shoulder joint. Netter, F. (2014). After passing over the glenohumeral joint it inserts onto the superior facet on the greater tubercle of humerus. It is innervated by the subscapular nerve. When looking at pathologies of the rotator cuff – as in all joints - one needs to differentiate between degenerative and traumatic lesions. The suprascapular artery passes through the suprascapular notch, along with the suprascapular nerve to supply supraspinatus. 19 chapters | It is part of the rotator cuff muscle group. 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. 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. Auflage, Elsevier Verlag (2005). News, opinions & thoughts of anatomy, medical imaging. 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. The teres minor muscle originates from the lateral border of the scapula and inserts on the greater tubercle of the humerus. [1] Insertion IMAIOS is a company which aims to assist and train human and animal practitioners. – It is part of the rotator cuff muscle group. It is a small triangular-shaped muscle, located on the posterior aspect of the scapula. These cookies are used to measure audience: it allows to generate usage statistics useful for the improvement of the website. Susan Standring. Do not hesitate to suggest a correction, we will examine it carefully. In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. The infraspinatus gets its name because this muscle is located in the infraspinous fossa, a concave surface at the back of the scapula. (2013) ISBN: 9781451119459 -, 3. Gray's Anatomy. Supraspinatus receives arterial supply from the suprascapular artery, a branch of the thyrocervical trunk of subclavian artery. The infraspinous fossa is the concave surface at the back of the scapula. Conversely, the teres minor muscle’s function consists primarily of external rotation and adduction of the arm. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. Once you've finished editing, click 'Submit for Review', and your changes will be reviewed by our team before publishing on the site. Your IP: Another possible cause for an impingement is a bony subacromial spur resulting in a narrowing of the nerve with pain. 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? 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 infraspinatus muscle is a moderately-sized, triangle-shaped muscle found in the shoulder-blade region of the body. - 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? It originates from the back of the shoulder blade (scapula) and attaches to the back of the upper arm (humerus). Please contact. and grab your free ultimate anatomy study guide! Supraspinatus is innervated by the suprascapular nerve, formed by the anterior rami of spinal nerves C5 and C6. For more information, see our privacy policy. 2023 This muscle is one of the four muscles that form the rotator cuff, which functions to stabilize the shoulder joint. The starting position (left) and the finished position (right). Treatment may include: dry needling. This category only includes cookies that ensures basic functionalities and security features of the website. 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. IMAIOS is a company which aims to assist and train human and animal practitioners. Essential Clinical Anatomy, 5th Edition, Wolters Kluwer. 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). Supraspinatus muscle (Musculus supraspinatus) - Yousun Koh. The infraspinatus muscle is a component of the rotator cuff; the latissimus dorsi muscle is the largest muscle of the back. Vogl, A.W., Mitchell, A.W. - Location, Regions & Parts, Deltoid Muscle: Origin, Insertion & Action, Teres Major: Location, Function & Innervation, What are the Rotator Cuff Muscles? Researchers have reported varying results of selective infraspinatus muscle strengthening, depending on the exercise and shoulder-joint position. • These cookies will be stored in your browser only with your consent. 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. You can consent to the use of these technologies by clicking "accept all cookies". Don't hesitate to suggest a correction, translation or content improvement. Click on a category of cookies to activate or deactivate it. I feel like it’s a lifeline. To benefit from all the features, it’s recommended to keep the different cookie categories activated. The subscapularis muscle is a powerful internal rotator which also supports the arm during abduction and adduction. The infraspinatus is susceptible to various injuries and conditions that can cause pain, weakness, and reduced range of motion. But opting out of some of these cookies may affect your browsing experience. ADVERTISEMENT: Supporters see fewer/no ads. The infraspinatus is an intrinsic muscle of the shoulder region. Infraspinatus muscle. Copyright © Abducts (elevates) the shoulder joint out to the side. The elbows can either be at the patient's side or abducted 90 degrees to further isolate the infraspinatus from the deltoid muscle. Infraspinatus is a thick triangular muscle that occupies the majority of the dorsal surface of the scapula. The rotator cuff muscles are a favourite exam topic! The muscle fibers of the infraspinatus pass laterally from the infraspinous fossa and insert on the greater tubercle of the humerus. Imprint them into your brain easily using the following mnemonic. When you visit IMAIOS, cookies are stored on your browser. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. The cervical nerves are nerves that originate from the neck region of the spinal cord. Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. By visiting this site you agree to the foregoing terms and conditions. Certainly the rotator cuff – as the name suggests – plays a major role in the internal and external rotation of the arm in the shoulder joint. In addition, the muscles tighten the joint capsule preventing a pinch during shoulder movements. The website cannot function properly without these cookies, which is why they are not subject to your consent. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. At the time the article was last revised Tae Gon Yoo had no recorded disclosures. 1/4 Synonyms: none Supraspinatus is the most superior of the four rotator cuff muscles. The action you just performed triggered the security solution. The. It also assists the deltoid muscle in abduction of the arm at the glenohumeral joint. Often those ruptures have been preceded by degenerative changes in the rotator cuff. Atlas of Human Anatomy, 6th Edition, Elsevier Saunders. It's attached to the top of your upper arm bone (humerus) and your shoulder blade (scapula). tus ˌin-frə-spī-ˈnāt-əs. Standring, S. (2008). [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. All rights reserved. Kim Bengochea, Regis University, Denver. Reference article, Radiopaedia.org (Accessed on 06 Jun 2023) https://doi.org/10.53347/rID-5139, {"containerId":"expandableQuestionsContainer","displayRelatedArticles":true,"displayNextQuestion":true,"displaySkipQuestion":true,"articleId":5139,"questionManager":null,"mcqUrl":"https://radiopaedia.org/articles/infraspinatus-muscle-1/questions/1222?lang=us"}, see full revision history and disclosures, medial (ulna) collateral ligament complex, lateral (radial) collateral ligament complex, accessory flexor digitorum superficialis indicis, accessory head of the flexor pollicis longus, superficial palmar branch of the radial artery, 1. 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. According to exercise position, Townsend et al 11 and Blackburn et al 6 reported that PER was more effective than SER in . Serving healthcare professionals through interactive anatomy atlases, medical imaging, collaborative database of clinical cases, online courses... © 2008-2023 IMAIOS SAS All rights reserved. The infraspinatus muscle plays a very important role in the mobility and stability of the shoulder joint. This video explains the anatomy of the infraspinatus muscle, one of the 4 rotator cuff muscles: origin, insertion and actions. Keith L. Moore, Arthur F. Dalley, A. M. R. Agur. Dimitrios Mytilinaios MD, PhD – You can freely give, refuse or withdraw your consent at any time by accessing our cookie settings tool. 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. 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. Reading time: 5 minutes. • 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. RCRSP Online Course here: https://study.physiotutors.com/course/rotator-cuff-related-shoulder-pain/GET OUR ASSESSMENT BOOK ︎ ︎ http://bit.ly/GETPT ︎ ︎OUR A. The infraspinatus is a skeletal muscle located beneath the scapular spine of the posterior shoulder. 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. Learn more about the supraspinatus and other muscles of the rotator cuff with the following quiz. 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. The information we provide is grounded on academic literature and peer-reviewed research. Found an error? This video explains the anatomy of the infraspinatus muscle, one of the 4 rotator cuff muscles: origin, insertion and actions. All rights reserved. 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. If you do not agree to the foregoing terms and conditions, you should not enter this site. It is a small triangular-shaped muscle, located on the posterior aspect of the scapula. Reviewer: Infrapinatus muscle is often involved in shoulder pathologies as shoulder impingement and rotator cuff tears. : 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. Suprascapular nerve damage causes shoulder weakness and muscle loss (atrophy). The infraspinatus (Latin: musculus infraspinatus) is a flat triangular-shaped muscle of the upper limb. Dan has taught college Nutrition, Anatomy, and Medical Terminology courses. It acts with teres minor to externally rotate the glenohumeral joint, and with other rotator cuff muscles to stabilize the shoulder. (2008) ISBN: 9780443066849 -, 2. Anatomy The infraspinatus is a thick triangular muscle in the upper back. transosseous fixation), depending on the severity of the rupture and the patient’s age.