Supraspinatus
Shoulder & Arm
The most commonly torn rotator cuff muscle — that pain when you raise your arm overhead? Often supraspinatus.
Function
Initiates arm abduction (first 15°), stabilizes glenohumeral joint
Origin
Supraspinous fossa of scapula
Insertion
Greater tubercle of humerus (superior facet)
Innervation
Suprascapular nerve (C5-C6)