NERVOUS SYSTEM. 1 17 



FlG, 17. NERVES OF THE DIGIT. 



p, Plantar nerve; B, Median branch; c, Anterior branch; D, Digital artery; H, In- 

 constant 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 the patilobes; R, Ra- 

 muscules accompanying the digital artery in the plantar fissure; v, Vein whose 

 presence is not constant, and which sometimes accompanies the plantar nerve 

 throughout its phlangeal 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 cutaneous 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 pectorali, 

 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 

 musculo-cutaneous, 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 plantar. 



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 muscle. 



Crural or anterior femoral, to muscles of thigh, and by saphenous 

 branches to skin of inner side of thigh and leg. 



Obturator, 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 



