TRAPEZITS 87 



Origin. The occipital bone, the ligamentum nuchae, and the 

 spinous processes of the thoracic vertebras. Insertion. The spine 

 of the scapula and lateral third of the clavicula. 



Action. With the shoulders stationary the trapezius acts upon 

 the head to pull it backward or sideways. With the head station- 



FIG. 75. SUPERFICIAL AND MIDDLK MUSCULAR LAYERS o? JHE POSTERIOR ASPECT 



OF THE TRUNK. (Sappcy.) 



i, Trapezius; 2, latissimus dorsi; 3, aponeurosis; 4, 5, 6, 8, 19, 20, different por- 

 tions of latissimus dorsi; 9-12, deep muscles; 13, sterno-mastoid; 14, splenius; 15, 

 elevator of scapula; 16, infraspinatus; 17, teres minor; 7, 18, teres major; 21, portion 

 of anterior serratus; 22, 23, abdominal muscles; 24, 25, gluteus maximus; 26-30, 

 deep muscles; 31, deltoid; 32, triceps. 



ary it can elevate the shoulder-girdle and the whole upper ex- 

 tremity with it. Both muscles together can draw the shoulders 



