66 



at the angle of the mouth, remove the skin between it and the 

 arm and tympanum. The projection formed by the articu- 

 lation of the lower and upper jaws may be cut off. Remove 

 the arm. Dissect away the muscles and expose the scapula; 

 this in turn may be tilted to one side or removed. In front of, 

 and partially under, the scapula nerves may be seen. Two 

 nerves will be found lying close together and accompanied by 

 a blood vessel. The first of these nerves is the glossophar- 

 yngeal, the second the vagus with its branches. Follow both 

 nerves toward the cranium and note that both glossopharyngeal 

 and vagus emerge from the cranium through the same foramen. 



Dissect the glossopharyngeal distally and note that it 

 supplies the tongue. 



Dissect the vagus noting that it gives off a branch to the 

 oesophagus, then a smaller one the laryngeal curving around 

 the aorta to supply the larynx, and finally branches to the 

 lungs and heart. 





G Tflc'ilis,-'' 



C a sTT»cnf mius- 



■Tftr'ia, 



Tibiftl'S -1^//// ''■'■uris 



■posTtcu < 



■■"Tibia I13 

 ttniicus 



FIG. 3 

 Fig. 3. Ventral aspect of the superficial muscles of the left leg of the frog. 



263. Dissection of Muscles of Frog's Thigh and Leg. 

 Ventral Aspect. Remove the skin from the ventral aspect of 

 the leg and expose the superficial muscles. 



