30 THE NECTURUS 



is inserted on the femur, distal to the insertion of the first 

 slip. The third slip originates in the puboischiac fossa and 

 on the ilium, curves around the posterior border of the 

 ilium and is inserted on the dorsal face of the femur, 

 extending to about the middle of the bone. It is not quite 

 parallel to the rest of the muscle, as it must diverge 

 slightly to pass around the posterior side of the ilium. 

 Some fibers come from the ilium itself. Get the details of 

 this muscle after the removal of the girdle from the body. 



Pubotibialis 



Posterior to the puboischiofemoralis interims, this muscle 

 is quite evident, although the insertion and origin are 

 hidden. By a slight separation of the muscles the origin 

 can be seen at the anterior edge of the acetabulum on the 

 pubis where a tendon is formed. The insertion is on the 

 proximal, ventral face of the tibia. 



By sectioning the puboischiotibialis, it is possible to study 

 the several muscles that are exposed by this operation. 



Femoro-fibularis 

 After pushing the pubotibialis forward note this small 

 muscle originating on the posterior face of the femur at 

 about the middle of the bone. It extends out to the fibula 

 where it is inserted on the proximal end. 



CAUDAL MUSCLES 



The three caudal muscles can now be dissected out on 

 the ventral side. The outer muscle is the pyriformis, the 

 inner the ischiocaudalis and the deeper central element 

 the femorocaudalis. 



Pyriformis 



This is the outer of the three tail muscles of the tail. 

 It originates on the hsemapophyses of vertebrae number 



