

738 



SERVES OF THE ARM. 



nted to the subscapular, latissimus dorsi, and teres major 



muscles. 



The internal cutaneous nerve (Fig. 239) arises from the 



lower part of t the plexus, in common with the inner 



head of the median, and is among the smallest of the 

 FIG. 239. nerves supplying the arm. It de- 



scends in company with the basilic 

 vein, and above but near the elbow it 

 divides into an external or anterior, 

 and internal or posterior branch. Be- 

 fore this division, the nerve sends 

 filaments through the fascia to the 

 biceps, the inner portion of the tri- 

 ceps, and the integuments. The exter- 

 nal branch goes in front, and some- 

 times behind, the median basilic vein. 

 Sometimes there is a branch of it both 

 in front and behind the vein ; it de- 

 scends over the bend of the elbow to 

 fie forearm, as low as the wrist, sup- 

 plying the Integuments in its course. 

 The internal branch goes to the inner 

 condyle, and separates into filaments, 

 some of which go in front, but the 



most pass on the back part of the forearm, to supply chiefly 



the integuments. 



The lesser internal cutaneous, or nerve of Wrisberg, (Fig. 



239,) comes also from the lower part of the plexus, and is 



considered an accessory branch to the internal cutaneous. 



It is a small, long branch, passing down the back of the 



arm, and at the middle of the latter going through the 



FIG. 239 represents the Cutaneous Nerves of the Elbow Joint, a Radial 

 vein. 6 Cephalic vein, c Anterior ulnar vein, d Posterior ulnar vein, t 

 Common ulnar vein. / Basilic vein, g Where basilic vein pierces the fascia. 

 h Median vein, i A deep vein uniting with the median, j Median cephalic. 

 k Median basilic. J Fascia, m Aponeurotic band from the tendon of the 

 biceps, n Cutaneous portion of musculo-cutaneous nerve, o Internal cutane- 

 ous nerve, p Lesser internal cutaneous, or nerve of Wrisberg. q External 

 cutaneous branch of musculo-spiral nerve. 



