A MANUAL 



O^ A 



N ATOMY 



In the thoracic region the internal branches of the upper six nerves 

 become cutaneous near the spines of the vertebrae, and then turn 

 outwards in the integument. The branch of the second is character- 

 ized by its great length, and it can be traced well outwards over 

 the scapula. The external branches of the upper six thoracic 

 nerves end in the muscles. The internal branches of the lower six 

 thoracic nerves are muscular, and the external branches become 



Trapezius 



Deltoid 



Cutaneous ^ 



Nerves ; I 



of \ .If 

 Back. 



,Teres Major 



—Triceps 



Latissimus Dorsi 



_Obliquus Externus Abdominb 



. Gluteal Cutaneous Branches from first three 

 — j Lumbar Nerves 



Gluteus Medius 



Gluteus Maximus 



Fig. 167. — The Superficial Dissection of the Back. 



cutaneous along the course of the angles of the ribs. In the lumbai 

 region the internal branches end in the muscles. The externa 

 branches of the first three nerves furnish cutaneous offsets whicl 

 descend over the iliac crest in front of the outer border of tM 

 erector spinae to the gluteal integument, supplying in their cours^ 

 the integument of the lumbar region. The external branches 01 

 the lower two nerves end in the deep muscles. In all cases thf 



