i yo THE POCKET ANATOMY 



with the patellar branch of the internal or long saphenous 

 nerve. 



Deep or posterior part : which gives off : 



Internal or long saphenous : accompanies, lying on outer side 

 of, femoral vessels as far as Hunter's canal, where it crosses, 

 artery, and leaves it at opening in adductor magnus by passing 

 inwards beneath sartorius. Here it. becomes subcutaneous, 

 and is continued with the internal saphenous vein along inner 

 side of leg, behind inner border of tibia, and, passing in front 

 of inner ankle, is distributed on inner side of foot as far as 

 ball of great toe. In its course it gives off a branch to plexus 

 under sartorius formed by obturator and internal cutaneous 

 nerves, to patellar plexus, and below the knee to the integu- 

 ment on the anterior and inner surfaces of the leg. 



Muscular. To the rectus, which gives branch to hip-joint. 



To the vastus externus, which gives an articular branch to the 

 knee-joint, and accompanies descending branch of the external 

 circumflex artery. 



To the vastus internus, which gives off an articular branch to 

 the knee-joint, and accompanies the deep branch of the 

 anastomotica magna artery. 



To crureus, two or three, the internal one supplying sub- 

 crureus and knee-joint. 



SACRAL NERVES, five in number. The roots of origin form 

 the cauda equina, and in this region t.he posterior root ganglia 

 are placed inside the spinal canal, though outside the dura 

 mater. Each nerve divides into anterior and posterior primary 

 branches. 



The posterior primary branches of the upper four emerge 

 from the posterior sacral foramina, the fifth at the lower end 

 of the spinal canal ; the upper three nerves divide into internal 

 and external branches, the former supplying the multifidus 

 spinae, the latter the integument over sacrum, coccyx, and 

 posterior gluteal region ; the two lower nerves do not divide, 

 and supply filaments to integument over coccyx, the 5th com- 

 municating with the coccygeal. 



COCCYGEAL NERVE : this nerve divides into an anterior 

 branch, which pierces sacro-sciatic ligament and coccygeus, 

 supplies integument over coccyx, and communicates with the 

 5th sacral, forming part of ano-coccygeal plexus ; and a 

 posterior, to supply coccygeal integument. 



The ANTERIOR PRIMARY BRANCHES decrease in size from 

 above downwards. The upper four issue from the anterior 

 sacral foramina, the 5th emerging between sacrum and coccyx. 

 Each nerve communicates with the sympathetic. The first 



