70 ANATOMY AND PHYSIOLOGY FOR NURSES 



The supraspinatus arises from the supraspinous fossa. 

 Inserted into the upper facet on the greater t tuberosity 

 of the humerus. Action, assists the deltoid; fixes the head 

 of the humerus in the socket. Nerve, suprascapular. 



FIG. 38. 



FIG. 37. Superficial muscles of shoulder and arm (from in front) : I, 

 Pectoralis major; 2, deltoid; 3, biceps; 4, brachialis anticus; 5, triceps; 6, 

 pronator radii teres; 7, flexor carpi radialis ; 8, palmaris longus ; 9, flexor 

 carpi ulnaris 10, supinator longus ; u, extensor ossis metacarpi pollicis ; 12, 

 extensor brevis pollicis; 13, flexor sublimis digitorum ; 14, flexor longus 

 pollicis; flexor profundus digitorum; 16, palmaris brevis; 17, abductor 

 pollicis. 



FIG. 38. Superficial muscles of shoulder and arm (from behind) : i, 

 Trapezius; 2, deltoid; 3, rhomboideus major; 4, infraspinatus ; 5, teres 

 minor; 6, teres major; 7, latissimus dorsi ; 8, triceps; 9, anconeus; 10, 

 brachialis anticus ; n, supinator longus ; 12, extensor carpi radialis longior ; 

 13, extensor carpi radialis brevior ; 14, extensor communis digitorum ; 15, 

 extensor carpi ulnaris ; 16, flexor carpi ulnaris ; 17, extensor ossis metacarpi 

 pollicis ; 18, extensor brevis pollicis ; 19, tendon of extensor longus pollicis. 



Infraspinatus. Origin, infraspinous fossa. Insertion, 

 into the middle facet of the greater tuberosity of the 

 humerus. Action, rotates the humerus outward. Nerve, 

 suprascapular. 



