296 Journal of CoMrAKAXivK Neurolo(;y. 



Origin. — The anterior crural nerve is the ventral division 

 of the seventh lumbar, of which it is strictly the continuation 

 with a large accession from the sixth — or its origin may be 

 referred to the lumbar plexus. 



Principal Rami. — The ectal origin of the nerve lies entad 

 of the M. psoas, to which several filaments are given (Fig. 

 Pso.) 3 mm. peripherad of its origin; 5 mm. peripherad a 

 large branch is given caudad to the M. iliacus (Fig. M. il.). 

 The general course of the nerve trunk is embraced by the 

 M. psoas, the nerve reaching the ectal surface or lateral 

 border of the muscle in the region of the iliac notch, or 20 

 mm. ventro-caudad of its origin. Entad of Poupart's liga 

 ment (Fig. P.) it gives from its lateral border a large ramus 

 which innerves the sartorius muscle (Fig. Sar. ), which ramus 

 lies entad of a ramus of the profund artery 10 mm. from its 

 origin. As the nerve crosses the artery a slender branch 

 passes ectad of the artery to the mesal border of the sartorius 

 muscle. The larger portion of this branch lies upon the 

 ental surface of the muscle, and can be traced to its distal 

 extremity or insertion, thus innerving its distal three-fourths; 

 the smaller portion of the nerve is reflected proximad at the 

 profund artery, and innerves the proximal (origin) one-fourth 

 of the sartorius muscle, lying upon its ental surface. 



Entad of Poupart's ligament and 2 mm. peripherad of the 

 sartorial branch, from the mesal border of the nerve is the 

 ectal origin of the long saphenous nerve (N. cutaneus in 

 ternus longus, Fig. Saph. 1.). 



THE LONG SAPHENOUS NERVE. 



This nerve lies ectad of the femoral artery and apposed to 

 it and the long saphenous vein, the vein being mesad, the 

 artery in the middle, and the nerve laterad upon the surface 

 of the thigh. 



Principal Rami. — The first branch is given to the artery 

 (Fig. A. fern.). At the knee (Fig. K.) two ramuli are given 

 oft'; the lateral ramulus (Fig. 1. r.) is cutaneous; it accom- 



