The Frog — An Amphibious Vertebrate Animal 427 



VomQrhQ teeth 



floor of orbit 



i 



Esophagus _J'' 



Vocal iac 



Maxillary teeth 

 _ _ Internal nares 



_ Jc//a/5 marqinalis 



_ E.Uitach'ian tuoe 

 — Glottii 



€ Tonijae 



Fig. 212. — Mouth of bullfrog opened to show internal structures. (From Potter: 



Textbook of Zoology, The C. V. Mosby Co.) 



iivcr M 



Qall bladder 



Commor\ bile dact ,, 



Pancreatic duct _ 



large mtesb'me- 

 Ureter 



Oviduct J 



Anus 



Bsophaqus 

 — Liver 



..Cardiac erxi 

 of stomach 



Pyloric end 



of stomach 



Pancreas 



Ileum 



Jplecn 



Urinary 



bladder 



W^.. Cloaca 



Fig. 213. — Frog digestive system with associated organs. 



