426 Animal Biology 



shaped and is composed of a large, anterior cardiac part and a con- 

 stricted, posterior pyloric part which connects with the coiled small intes- 

 tine. The latter consists of an anterior duodenum, and a much coiled 



Jc/bmax;/lary_ 



Deltoid _ 



Pectorahs major 

 fAnb, portion^ 



Tricep5 ^ 



Pecboralis majorL . 



[Middle portion'^ 



Pectoral 15 major 



^yJbdominal portion) 



Rectus abdominis 



External oblique 



Tissue septum 



Bectus abdominis 



Linea alba 



Addactor \onqas 



Adductor macjnus 



Sartorius 



Triceps -femoris 



gracilis major 



gracilis minon 



gastrocnemius 



Extensor cruris 



Tibicjlis posticus 



nblo-fibula (hone) 



Tibialis antlcus )onqus^ 



Tendon of- Achilles 



Fig. 211. — Muscles of the frog (ventral view). Only the superficial muscles 

 are shown. The linea alba is a white line separating the right and left rectus 

 abdominis muscles. The triceps femoris has three heads one of which is the 

 vastus internus. The gracilis major is sometimes called the rectus internus major. 

 The gracilis minor is sometimes called the rectus internus minor. The muscles are 

 drawn somewhat diagrammatically, and some variations may be observed in dif- 

 ferent frogs. 



