NERVOUS SYSTEM. II7 



Fig. 17. — NEKVES of the digit. 



P, Plantar nerve; B, Median branch; c, Anterior branch ; d, Digital artery ; H, Inconstant 

 division given off to the cartilaginous bulbs; i, i, Branch to the plantar cushion; 

 K, Transverse coronary branch; M. Podophyllous branch; o, Pre-plantar branch 

 Q, Descending ramuscule to the fissure of thepatilobes; R, Ramuscules accompanying the 

 digital artery in the plantar fissure; v, Vein whose presence is not constant, and which 

 sometimes accompanies the plantar nerve throughout its phalangeal course. 



Branches. 



To extensors of forearm, metacarpus and digit, and external 

 flexor of metacarpus, and sensation to integument of anti -branchial 

 region. 



Ulnar, passes down behind humeral artery to inner side of 

 elbow, follows oblique flexor of metacarpus to pisiform bone, 

 where it divides into the cutatieous to skin of anti-brachial carpal 

 and external metacarpal regions and external plantar. It gives 

 off branches in its course to long extensor of forearm and pec- 

 torali, to all muscles of posterior brachial region, except external 

 and internal flexors of metacarpus. 



Median, arises from posterior part of plexus and a branch from 

 musculocutaneous, passes down in front of humeral artery, along 

 inner side of forearm, then lies anteriorly again and bifurcates at 

 lower one-third of forearm into external and internal platitar. 



Branches. 



To flexors of forearm and subcutaneous region of forearm. The 

 plantars give off the anterior, middle and posterior digital at the 

 fetlock, which supply the phalangeal region. 



LUMBO-SACRAL PLEXUS. 



Formed by last two lumbar and first three sacral nerves. 

 Divided into an anterior division lying under the psoas parvus, 

 and a posterior behind the internal iliac artery. The anterior is 

 formed by the last two lumbar, and gives off ilio-muscular to 

 iliacus miiscle. 



Crural or anterior femo7'al, to muscles, of thigh, and by 

 saphenous branches to skin of inner side of thigh and leg. 



Odturator, passes out of oval foramen to adductors of thigh, 

 pectineus, short adductor of leg and obturator externus. 



The posterior is formed by first three sacral, and gives off 

 small sciatic, which emerges from great ischiatic notch and divides 

 into anterior gluteal, to middle and small glutei, tensor vaginal 



