rotator cuff muscles

subscapularis origin

subscapular fossa of the scapula

subscapularis insertion

lesser tubercle of the humerus

subscapularis action

medially rotates the shoulder, stabilizes the head of the humerus in the glenoid cavity

subscapularis nerve

upper and lower subscapular nerve: C5, *C6*, C7

supraspinatus origin

supraspinous fossa of the scapula

supraspinatus insertion

greater tubercle of the humerus

supraspinatus action

initiates and assists deltoid in abduction of the shoulder joint, stabilizes head of humerus in glenoid cavity

supraspinatus nerve

suprascapular nerve: C4, *C5*, C6

infraspinatus origin

infraspinous fossa of the scapula

infraspinatus insertion

greater tubercle of the humerus

infraspinatus action

laterally rotates the shoulder joint (ER), stabilizes the head of the humerus in glenoid cavity

infraspinatus nerve

suprascapular nerve: *C5*, C6

teres minor origin

lateral border of the scapula

teres minor insertion

greater tubercle of the humerus

teres minor action

laterally rotates the shoulder joint, stabilizes the head of the humerus in glenoid cavity

teres minor nerve

axillary nerve: *C5*, C6