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Origin: (proximal attachment)
a. Infraspinous fossa of the scapula.
Insertion: (distal attachment)
a. Middle part of the greater tubercle of the humerus.
b. Helps stablize the shoulder by drawing the humerus toward the glenoid fossa of the scapula.
Nerves & Nerve Roots:
a. Suprascapular nerve.
a. C5 and C6.