CUTANEOUS NERVES. 



skin, one below and the other above incision F, are to be turned 

 outwards. 



A great part of the trapezius muscle will be found under the 

 upper flap, and of the latissinms dorsi under the lower flap. 



The reflection of the skin from over the upper part of the 

 trapezius is performed by the dissector of the head and neck. 



The cutaneous nerves should first be sought for in the superficial Cutaneous 

 fatty layer. They are accompanied by small arteries which will nerves: 

 guide tlie student to their position. The nerves vary much in size 



A B 



FIG. 1. PLAN OF THE CHIEF SKIN INCISIONS. 



in the different parts of the back, and their number is also irregular ; 

 as a general rule, there is one opposite each vertebra except in the 

 neck. 



Over the upper part of the thorax, they will be found near the 

 spines of the vertebrae, where they lie at first beneath the fat ; but 

 at the lower part, and in the loins, they issue in a line with the 

 angles of the ribs. 



CUTANEOUS NERVES. The tegumentary nerves are derived from how 

 the posterior primary divisions of the spinal nerves, which divide 

 amongst the deep muscles into two branches, inner and outer. 

 Arteries accompany the greater number of the nerves, bifurcate like 

 them, ami furnish cutaneous offsets. 



B 2 



