THE NECTURUS 35 



dorsal side of the pelvis. Parts of the muscle separate, 

 curve around the ilium on both sides and join after passing 

 around this bone. 



ISCHIOCAUDALIS 



This tail muscle originates on the tail vertebrae and is in- 

 serted on the dorsal side of the ischium. 



ISCHIOFEMORALIS 



A short muscle of small size is seen after the removal 

 of the body wall. It originates on the ischium and is 

 inserted on the proximal end of the femur. 



MUSCLES OF THE HEAD 



Drawings 13, 14, 15. Make three drawings of the head from the 

 dorsal, lateral and ventral sides, showing the musculature. 



Study the distribution of the muscles that are to he seen 

 and learn their names. You should recognize four head 

 muscles, the temporals, masseter, mylohyoid and cera- 

 tohyoid. In all of these dissections use the handle of the 

 scalpel. Dissections should consist of a separation rather 

 than a cutting of parts. 



DISSECTION OF THE MUSCLES OF THE HEAD 

 AND THROAT REGION 



Masseter 



The dorsal view of the head shows two large muscles, a 

 median pair the temporals and a lateral pair, the masseters. 

 First dissect loose the masseter from the left side and work 

 out its origin and insertion. Note the names of the bones 

 on which it originates and the type of the insertion on the 

 mandible. Trace the relations of this insertion to that of 

 the temporalis. 



