Muscle Atlas


Origin: Infraspinous fossa of scapula
Insertion: Middle facet on greater tuberosity of humerus
Action: Laterally rotate arm; helps to hold humeral head in glenoid cavity of scapula
Innervation: Suprascapular nerve (C5 and C6)
Arterial Supply: Suprascapular and circumflex scapular arteries

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