Subscapularis Muscle - Attachments, Action & Innervation
Supraspinatus Muscle – Attachments, Actions & Innervation
Supraspinatus is a small muscle of the upper arm. It’s one of the four muscles that make up the rotator cuff.
Attachments of Supraspinatus :Origin & Insertion
Origin: (proximal attachments)
a. Supraspinous fossa of the scapula.
Insertion: (distal attachments)
a. Superior aspect of the greater tubercle of the humerus.
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Actions of Supraspinatus:
a. Helps the deltoid muscle initiate the abduction of the arm at the shoulder (glenohumeral) joint.
b. Helps stablize the shoulder by drawing the humerus toward the glenoid fossa of the scapula.
Innervation of Supraspinatus:
Nerve to the muscle:
a. Suprascapular nerve.
a. C5 and C6.