THE NECTURUS 29 



PUBOISCHIOFEMORALIS EXTERNUS 



This is a large muscle with several slips that originate 

 on the ventral face of the girdle. These extend to the 

 femur and are inserted along the shaft. Note that the 

 fibers run in different directions and that slips may be 

 incompletely separated off from the main mass. If the 

 posterior slip is deflected, a still deeper slip will be seen. 

 This is called the adductor femoris. 



Ventral View of the Thigh 



This most anterior muscle which forms the border of 

 the thigh is the puboischiofemoralis internus. The pubo- 

 tibialis is next in order posteriorly. Then comes the 

 puboischiotibialis and finally, the posterior, distal slip of 

 the puboischiotibialis which extends from the raphe of 

 the main muscle to the ventral surface of the foot, joining 

 the fascia of this region. 



Puboischiofemoralis internus 



With the puboischiofemoralis externus removed, the 

 outlines of the muscle become evident, extending to the 

 midline of the dorsal side of the pelvic plate where it has 

 a large origin. This can be seen to better advantage after 

 the pelvic plate is removed, hence this observation is de- 

 layed until later in the dissection. The insertion is on the 

 femur. 



The muscle is divided into three slips. The anterior and 

 largest slip originates on the median line of the pubis, the 

 origin extending almost to the puboischiao fossa. After 

 entering the body it spreads out fan shaped, curves around 

 the ilium and is inserted along the whole anterior border 

 of the femur. A second slip originates on the median line 

 of the pelvic plate, immediately posterior to the anterior 

 slip, curves around the ilium, joins the anterior slip and 



