What is infraspinatus muscle?
Infraspinatus Muscle: Anatomy, Function, Clinical Assessment & Rehab Introduction The infraspinatus muscle is a key component of the rotator cuff , playing a vital role in shoulder stability and external rotation of the humerus. Understanding this muscle is essential for clinicians, physiotherapists, athletes, and students of anatomy. Dysfunction or injury to the infraspinatus is common in overhead athletes, manual workers, and individuals with poor posture or degenerative shoulder conditions. Anatomy of Infraspinatus Origin Medial two-thirds of the infraspinous fossa of the scapula. Insertion Middle facet of the greater tubercle of the humerus. Nerve Supply Suprascapular nerve (C5, C6). Blood Supply Suprascapular artery , with contributions from the circumflex scapular artery . Function of the Infraspinatus External rotation of the shoulder joint (humerus). Stabilization of the glenohumeral joint by compressing the humeral head into the g...