CUTANEOUS DISTRIBUTION OF THE XERVES. €23 



front and sides of tlie neck, and the upper part of tlie shoulder and 

 breast. 



The area of tlie anterior divisions of tlie dorsal and first lumlar 

 ncri'es meets superiorly ^vith that of the cervical plexus, and posteriorly 

 with that of the posterior divisions of dorsal and lumbar nerves. It 

 passes down over the haunch and along by the outer part of Poupart's 

 ligament, and includes part of the scrotum and a small portion of the 

 integument of the thigh internal to the saphenous opening. 



The perincmm and penis are supplied by the pudic nerve ; the 

 scrotum by branches of the pudic, inferior pudendal, and ilio-inguinal 

 nerves. 



3. In the Upper livah. — The slioidder, supi^lied superiorly by the 

 cervical plexus, receives its cutaneous nerves interiorly as far as the 

 insertion of the deltoid from the circumflex nerve. 



The arm internally is supplied by the intercosto-humeral nerve and 

 the nerve of "Wrisberg. The inner and anterior part is supplied by 

 the internal cutaneous nerve ; and the posterior aud outer part by the 

 internal and external branches of the musculo-spiral nerve. 



The forearm, anteriorly and on the outer side, is supplied by the 

 external cutaneous ; on its outer and posterior aspect, superiorly by the 

 external cutaneous branches of the musculo-spiral, and interiorly Ijy the 

 radial branch of the same nerve. On the inner side, both in front and 

 behind, is the internal cutaneous nerve, and inferiorly are branches of 

 the ulnar. 



On the hacJc of the hand are the radial and ulnar nerves, the radial 

 supplying about three fingers and a half or less, and the ulnar one and 

 a half or more. 



On the front of the hand, the median nerve supj^lies three fingers and 

 a half, and the ulnar one and a half In the 2'"^dm is a branch of the 

 median given off above the winst. On the hall of tlie thumb are branches 

 of the musculo-cutaneous, median, and radial nerves. 



4. In the Lower limb. — The buttock is supplied from above by the 

 cutaneous branches of the posterior divisions of the lumbar nerves, 

 with the ilio-hypogastric and lateral branches of the last dorsal nerves ; 

 internally by the posterior divisions of the sacral nerves ; externally by 

 the posterior branch of the external cutaneous nerve proceediug from 

 the front ; and inferiorly by branches of the small sciatic nerve proceed- 

 ing from below. 



The thiffh is supplied externally by the external cutaneous nerve ; 

 posteriorly, and in the upper half of its inner aspect, by the small 

 sciatic ; anteriorly, and in the lower dialf of the inner aspect, by the 

 middle and internal cutaneous. 



The leff is supplied posteriorly by the small sciatic and short 

 saphenous nerves ; internally by the long saphenous and branches of 

 the iuternal cutaneous of the thigh ; and outside and in front by cuta- 

 neous branches of the external popliteal nerve and by its musculo- 

 cutaneous branch. 



On the dorsum of the foot are the branches of the musculo-cutaneous, 

 supplying all the toes with the exception of the adjacent sides of the 

 first aud second, which are supplied by the anterior tibial, and the 

 outer side of the little toe, which, with the outer side of the foot, is 

 supplied by the short saphenous nerve. The long saphenous is the 

 cutaneous nerve on the inner side of the foot. 



