Infraspinatus

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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) (C5, C6)

Arterial Supply Suprascapular and circumflex scapular arteries