Muscles of upper limb
The muscles of upper limb are divided into: shoulder arm forearm hand Muscles of shoulder Deltoid Supraspinatus Infraspinatus Teres minor Teres major Subscapularis Deltoid Origin : lateral one-third of clavicle, acromion, and spine of scapula Insertion : deltoid tuberosity of humerus Action : abducts the arm; anterior part may flexes and medically rotates the arm and the posterior part extends and laterally rotates arm Supraspinatus Origin : the supraspinous fossa of the scapula Insertion : upper of the three facets on the greater tubercle of the humerus. Action : stabilizes shoulder joint and abducts the arm Infraspinatus Origin : the infraspinous fossa of the scapula Insertion : middle facets on the greater tubercle of the humerus. Action : stabilizes shoulder joint and laterally rotates the humerus. Teres minor Origin : the upper two-thirds of lateral border of the scapular on the dorsal surface. Insertion : the lowest facet on the greater tubercle of the humerus. Action : laterall...