Muscles of the T5ack. 



!85 



Protulierantia occipitalis externa 



Processus spinosus vertebrae 

 cerviealis VII 



Spina scapulae 

 Acromion 



M. seuiispinalis capitis 



M. splenius capitis et cervicis 

 M. levator scapulae 



M. rhomboideus minor 



JI, rhomboideus major 



Fascia infraspinata 



M. supraspinatus 



M. deltoideus 



Processus spinosus vertebrae thoraralis VI 



M. latissimus dorsi 



M. teres major 



M. triceps brachii 

 M. teres minor 



330. Broad muscles of the back 



(2"'^ layer), viewed from behind. 

 (The mm. trapezii and sternocleidomastoidei have been removed.) [Text see also pp. 286 287. J 



M. trapezius (see Fig. 329). Form: flat, triangular, broad. Position: in the neck and 

 upper part of the back, just beneath the skin. Origin (see also Fig. 296): tendinous froin 

 the linea nuchae superior, protuberantia occipitalis externa, lig. nuchae and lig. supraspinal 

 as far as the 1211^ thoracic verteljra; the tendon fibers are connected with those of the other 

 side, are longer in the neighborhood of the vertebra prominens, and there form, on each side, 

 a triangular area. Insertion: the upper fibers extend oblicfuely downward and forward to the 

 acrominal extremity of the claviel'-, the middle fibers transversely to the acromion and to the 

 sjiine of the scapula: the luwev libers obii"'" - "i.'-.-..-r! nnH lateralward to become attached 

 by a small, triangular, flat tendon to the ii le of the scapula. Action: it 



draws the shoulder-blade toward the spi'^t ..i.; >. .. .. _ ..lat the angulus inferior is dis- 



placed lateralward. the nngnlus later&li.s npwird: when, the .<U')Older-blade is fixed, it draws 

 the head backward and r.'tiit<r ' along with tlie face, 6"i"ewhat toward the other side. 

 Innervation: r. externus n. i\''\ssorii and .i branch of the plexus cerviealis. 



Spalteholz, Atlas. J9 



