DISSECTION OF THE DOG 



117 



Dissection. — Remove the skin from the side of the neck, shoulder, and 

 trunk. Preserve the cutaneous nerves, the largest of which are derived 

 from the second, third, and fourth cervical spinal nerves. 



M. CuTANEUS. — On the removal of the skin from the neck, thorax, and 

 abdomen, a muscular sheet, the cutaneous muscle, is revealed. This is divisible 

 into two parts : (1) the cutaneous muscle of the face and neck, and (2) the 

 cutaneous muscle of the thorax and abdomen. 



Olandida parotis 



m. cleido-cervicaHs 



' Olandida svhmaxillaris 



m. trapezius ^cervicalis 

 . trapezius thoracalis \ 



m. latissimus dorsi 



^ mm. stemo-hyoideits 



\ et sterno-thj/remdeus 



m. sterno-cephalicus 



. ohliquus abdominis extemus 



V. jugularis externa 

 m. onw-transversarius 

 / m. deltoideus 

 "^m. stemo-ceplialicus 

 - m. triceps trachii. Caput longum 

 ^- V. cephalica 

 - m. triceps trachii. Caput laterale 

 m. hrachialis 



FXG. 44. — Superficial dissection of the shoulder and neck. 



(1) M. cutaneus faciei et colli. — In the neck the cutaneous muscle is arranged 

 in two strata, the deeper of which consists of transverse fibres and extends from 

 the""manubrium sterni to the larynx. The superficial stratum contains fibres 

 which run obUquely ventro- orally, and is continued to the face. In the 

 face itself there is a third, still deeper layer confined to the region of the chin, 

 where it forms the submental muscle. 



(-2) M. cutaneus abdominis et pectoris.— Govenng the whole of the lateral 

 ' aspect of the abdomen and thorax caudal to the scapula is an extensive sheet 



