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DR. GADOW ON THE ANATOMY OF PTEROCLES. [Mar. 21, 



from the posterior part of the crural plexus passes out, and theu 

 runs along the inner side of the thigh, superficially to the inner side 

 of the proximal end of the leg (Ruge's branch, as termed by me in 

 my paper on the Ratitse). The ambiens muscle, on account of its 

 nervous supply, belongs to the crural plexus, as the nerve of this 

 muscle is one branch of the large nervous stem which passes laterally 

 from the m. ambiens into the inner head of the m. femoro-tibialis 

 (m. rectus internus feraoris). 



The m. femoro-tibialis (mm. vasti or m. cruraeus) consists of three 

 heads. The inner one (m. rectus internus femoris) is the biggest 

 and most distinct ; it arises from the whole inner and hinder aspect 



Fig. 1. 



Deeper adductor muscles of the right thigh of Pf erodes arenarius 



of the femur, and is inserted, independently of the others, into the 

 anterior crest of the tibia. The middle head is also very fleshy, 

 arises from nearly the whole of the anterior aspect of the femur, 

 takes up the distal part of the m. ilio-tibialis, and is inserted into 

 the patella and into the head of the tibia. The third or outer head 

 is quite separate from the others, and is inserted into the outer edge 

 of the caput tibiae by the help of the ligamentum tibio-patellare. 

 All these three heads are supplied by nerves from the crural 

 plexus. 



The m. ilio-Jibularis (m. biceps) takes its origin from the lateral 



