All content published on Kenhub is reviewed by medical and anatomy experts. Quiz Course 4K views What is the Infraspinatus Muscle? Register now Learn more about the supraspinatus and other muscles of the rotator cuff with the following quiz. During anatomical dissection, an additional muscle structure was found. Don't hesitate to suggest a correction, translation or content improvement. (1994) ISBN: 044304662X -. Each rotator cuff muscle performs a specific, important job that helps your shoulder joint work. After passing over the glenohumeral joint it inserts onto the superior facet on the greater tubercle of humerus. The teres minor muscle originates from the lateral border of the scapula and inserts on the greater tubercle of the humerus. Kim Bengochea, Regis University, Denver. It is part of the rotator cuff muscle group. The treatment can be either of conservative or surgical nature (e.g. For questions regarding business inquiries. When you visit IMAIOS, cookies are stored on your browser. In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. The infraspinatus is a skeletal muscle located beneath the scapular spine of the posterior shoulder. It arises mostly from the infraspinous fossa of scapula, and connects it to the proximal humerus . Together with the other rotator cuff muscles, supraspinatus stabilizes the glenohumeral (shoulder) joint during the movements of the upper limb. - 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? This muscle is one of the four muscles that make up the rotator cuff. . Keith L. Moore, Arthur F. Dalley, A. M. R. Agur. As the infraspinatus acts at the shoulder joint, it belongs to the muscles of the shoulder girdle. Copyright © Necessary cookies are absolutely essential for the website to function properly. 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 Infraspinatus is one of the four rotator cuff muscles, alongside subscapularis, teres minor and supraspinatus muscles. What is In Vitro Fertilization and How Does It Work? It is the infraspinatus muscle, one of the many muscles that make up the shoulder joint. Your feedback helps us to improve the content. The infraspinatus is an intrinsic muscle of the shoulder region. [caption id="attachment_8653" align="aligncenter" width="964"]. - Location, Regions & Parts, Deltoid Muscle: Origin, Insertion & Action, Teres Major: Location, Function & Innervation, What are the Rotator Cuff Muscles? Infraspinatus Muscle - Attachments, Actions & Innervation. Is our article missing some key information? This category only includes cookies that ensures basic functionalities and security features of the website. Once you've finished editing, click 'Submit for Review', and your changes will be reviewed by our team before publishing on the site. The infraspinatus is susceptible to various injuries and conditions that can cause pain, weakness, and reduced range of motion. For more information, see our privacy policy. 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). Auflage, Urban & Fischer Verlag (2003), Berchtold: Chirurgie, 6. According to exercise position, Townsend et al 11 and Blackburn et al 6 reported that PER was more effective than SER in . The infraspinatus is innervated by the suprascapular nerve that arises from the fifth and sixth cervical (C5, C6) nerve roots of the brachial plexus. Create your account. 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. Conversely, the teres minor muscle’s function consists primarily of external rotation and adduction of the arm. Attachments: Originates from the infraspinous fossa of the scapula and attaches to the greater tubercle of the humerus. Read more. Your infraspinatus muscle is a thick triangular muscle located at the back of your shoulder. 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. - Symptoms, Causes & Treatment, Frontal Sinus Trephination: Definition & Purpose, Non-Placental Mammals: Definitions, Characteristics & Examples. Serving healthcare professionals through interactive anatomy atlases, medical imaging, collaborative database of clinical cases, online courses... © 2008-2023 IMAIOS SAS All rights reserved. Underlying structures: There are no anatomical children for this anatomical part. Niamh Gorman MSc 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. Like all rotator cuff muscles, the infraspinatus functions to stabilize the shoulder joint. 19 chapters | News, opinions & thoughts of anatomy, medical imaging. 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 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. 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). The infraspinatus is an intrinsic muscle of the shoulder region. It extends between the scapula and humerus. As the infraspinatus acts at the shoulder joint, it belongs to the muscles of the shoulder girdle. Supraspinatus muscle (Musculus supraspinatus) - Yousun Koh. The infraspinatus acts to laterally rotate the arm and act in synergy with the rotator cuff muscles. However, the latissimus dorsi has more frequent variations than the infraspinatus. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Insertion: Distal to the greater tubercle of the humerus. All rights reserved. Cloudflare Ray ID: 7d3288b3480a3d13 Abducts (elevates) the shoulder joint out to the side. The supraspinatus muscle initiates the abduction of the of the arm. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. The infraspinatus muscle is the most commonly injured one of the four rotator cuff muscles, with swimmers, tennis players, and weight trainers particularly vulnerable. Read more. I feel like it’s a lifeline. Last reviewed: June 09, 2022 [Hrsg. tus ˌin-frə-spī-ˈnāt-əs. Test yourself with our rotator cuff quiz on https://khub.me/qkhxjOh, are you struggling with learning anatomy? 2023 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 . It. Structure [ edit] It is a small triangular-shaped muscle, located on the posterior aspect of the scapula. It originates from the back of the shoulder blade (scapula) and attaches to the back of the upper arm (humerus). origin: infraspinous fossa of the scapula, insertion: middle facet of the greater tubercle of the humerus, arterial supply: suprascapular and circumflex scapular arteries1. The subscapularis muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, infraspinatus and teres minor. He has a B.S. To find out more, read our privacy policy. When you visit IMAIOS, cookies are stored on your browser. It originates in the infraspinatous fossa of the scapula and inserts on the greater tubercle as well. 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). You can consent to the use of these technologies by clicking "accept all cookies". 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. 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). It attaches to the top of the humerus (long bone of the upper arm). By visiting this site you agree to the foregoing terms and conditions. Gray’s Anatomy for Students, 3rd Edition, Churchill Livingston Elsevier. 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. Reading time: 5 minutes. The infraspinatus muscle plays a very important role in the mobility and stability of the shoulder joint. 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. • (2013) ISBN: 9781451119459 -, 3. The tendon of supraspinatus is separated from the coracoacromial ligament, the acromion and the deltoid muscle by the subacromial bursa. Infraspinatus is a thick triangular muscle that occupies the majority of the dorsal surface of the scapula. {"url":"/signup-modal-props.json?lang=us"}, Jones J, Yoo T, Knipe H, et al. The infraspinatus is a thick and triangular muscle. You can freely give, refuse or withdraw your consent at any time by accessing our cookie settings tool. You also have the option to opt-out of these cookies. Roberto Grujičić MD Make sure you're prepared for questions on its attachments, innervations and functions with our upper extremity muscle anatomy revision chart. Shoulder injuries usually result from repetitive strain rather than sudden movements, but sudden impacts may also cause tears. Suprascapular nerve damage causes shoulder weakness and muscle loss (atrophy). Standring, S. (2008). Supraspinatus is innervated by the suprascapular nerve, formed by the anterior rami of spinal nerves C5 and C6. Auflage, Elsevier Verlag (2008), Rössler H., Rüther W. The following article describes the anatomy, including the origins and insertions, together with the function and pathologies of the rotator cuff. 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. In addition, the muscles tighten the joint capsule preventing a pinch during shoulder movements. It acts as a lateral collateral ligament of the shoulder joint. In the human body, the rotator cuff is a functional anatomical unit located in the upper extremity. 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. Atlas of Human Anatomy, 6th Edition, Elsevier Saunders. These muscles all originate from the scapula and insert in the humerus. Rotator cuff muscles dysfunction leads to shoulder impingement as the head of the humorous superiorly migrates during arm elevation. It arises from the subscapular fossa and inserts on the lesser tubercle of the humerus. Reading time: 3 minutes. 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. Do not hesitate to suggest a correction, we will examine it carefully. The subscapularis muscle is very important for the internal rotation of the humerus. 4,6,10,11,19 Furthermore, the optimal shoulder position to specifically strengthen the infraspinatus muscle is controversial. Researchers have reported varying results of selective infraspinatus muscle strengthening, depending on the exercise and shoulder-joint position. [1] Enrolling in a course lets you earn progress by passing quizzes and exams. Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. 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. Dr. Christopher A. Becker It extends between the scapula and humerus.