40 



DISSECTION OF THE ARM. 



Seek super- 

 ficial veins. 



shown on fig. 1, B, should be used. The skin will thus remain 

 hinged along a narrow attachment running down the middle 

 of the back of the arm, from which it can be used to cover 

 the part. 



The cutaneous veins (fig. 16) should be first sought for in 

 tlie ^ ^^ ^ yerv numerous below the bend of the elbow, as 

 they issue from beneath the integument. In the centre of the 

 forearm is the median vein, which bifurcates rather below the 

 elbow, sending branches to either side. On the outer side is 



Anastomotica 

 Magna Artery 



Internal Cutaneous 



Nerve ; posterior 



branch. 



Internal Cutaneous 



Nerve ; anterior 



branch. 



Musculo-cuta- 

 neous Nerve ; 

 posterior branch. 



Musculo-cutaneous 

 Nerve ; anterior 

 branch. 



Radial 

 recurrent Artery. 



Supinator longus. 



Extensor carpi 

 Radialis longior. 



FIG. 16. DISSECTION OP THE FRONT OF THE ELBOW (AFTER MORRIS). 



Trace cuta- 

 neous 

 nerves 



of outer 

 side 



the radial vein ; and internally are the anterior and posterior ulnar 

 veins, coming from the front and back of the forearm. At the 

 elbow the veins are united into two stems, one (basilic) passing 

 upwards along the inner side, and the other (cephalic) along the 

 outer side of the arm. 



The cutaneous nerves are next to be traced out. Where they 

 perforate the deep fascia they lie beneath the fat ; and this layer 

 must be scraped through to find them. 



On the outer side of the arm, about the middle, two external 

 cutaneous branches of the musculo-spiral are to be sought. In the 

 outer bicipital groove, in front of the elbow or rather below it, the 



