48 



General Biology 



in contact to adhere. It is interesting to know that unless an object 

 is moving, the frog pays no attention to it. The mouth or oral opening 

 is relatively large. The opening on the interior is called the buccal 



Fig. 6. A Male Frog Dissected from the Ventral Side. 



a.ab.v., Anterior abdominal vein, cut short, ligatured, and turned back, a.musc, 

 cut edge of abdominal muscles; bl., urinary bladder; c.d., common duct of gall- 

 bladder and pancreas; d.ao., dorsal aorta;du., duodenum; f.b., fat body; jem.v., 

 femoral vein; g.b., gall-bladder; lit., heart; hy.n., hypoglossal nerve; im., ileum; 

 i.v.c, inferior vena cava; k., kidney; k.d., kidney duct with vesicula seminalis; 

 lr., liver; a., point at which c.d. enters the duodenum; pes., pancreas; pl.v., pelvic 

 vein; r.L, right lung; rm., rectum; r.p.v., renal portal vein; sar., sartorius muscle; 

 sm., mylohyoid muscle; sp., spleen; st., stomach; t., testis; v. v., vesical vein. (After 

 Borradaile.) 



( ) cavity. There are teeth on the maxilla ( ), 



premaxilla ( ), and vomer bones ( ). 



These assist in holding, but not in masticating the food. Immediately 



