"origin: middle third of the lateral border of the scapula"
"insertion: inferior facet of the greater tubercle of the humerus"
"innervation: axillary nerve (C5-6)"
"arterial supply: circumflex scapular artery 1"
"action: external rotation, weak adductor of the humerus, stabilises the shoulder joint, holds the head of the humerus down against the upward pull of the deltoid during arm abduction"