Chap. III.] 



GENERAL ANATOMY. 



attached to it are certain glands which pour their secretion into 

 the canal. The parts of the alimentary canal are mouth, oeso- 

 phagus, stomach (St.), small 

 intestine (Sin. In.), and large 

 intestine (L. I. ). The glands 

 attached are the liver and 

 the pancreas (Pn.). The 

 cavity in which the canal 

 and its glands lie is called 

 the pi euro-peritoneal cavity 

 or ccelom. 



The stomach (St.) 



EX.JU. 



5.ci. 



IS 



elongated, and lies well 

 over to the left (the frog's 

 left) side. It is much 

 hidden by the large brown 

 liver. But if we lift the 

 lobes of the liver we shall 

 see it pass anteriorly into 

 the oesophagus. Posteriorly 

 it passes at the valvular 

 pylorus into the small intes- 

 tine (Sm. In.), which is 

 This, in turn, 



FIG. 7. VISCERA OF MALE FROG. 



In the female the large ovaries and the coiled 

 white oviducts occupy much space. 



Ant. cib. Anterior Abdominal vein. Ao. Aortic 

 arch. At. Atrium. Ca. Carotid gland and artery. 

 SOmewhat Suddenly into the Ex. Ju. External jugular vein. G. El. Gallbladder. 

 e , 4 .- / ./T T\ j /n. Innominate vein. L. /. Large intestine. Li. 

 large intestine (L. /.), and L . ^ artery p Pulmonary artery, pe. ca. 



this into the cloaca, Open- Pericardial cavity. Pn. Pancreas. S. Cl. Sub- 



1-1,1 clavian vein. Sm. In. Small intestine. Sp. Spleen. 



IDg OUtwardS by the Vent. Tt Am Truncus arteriosis. Ts. Testis. Ur. El. Urin- 



The parts of the canal are ar y bladder, v. ventricle, 

 connected together, and with the dorsal wall of the cavity, 

 by a transparent membrane, the mesentery. The whole pleuro- 

 peritoneal cavity is, moreover, lined with a glistening pig- 

 mented membrane, the peritoneum, which forms the double 

 layer of the mesentery, and so passes on to the viscera. Thus 

 there is an outer (parietal or somatic) layer lining the walls 

 of the cavity, and an inner (visceral or splanchnic) layer re- 

 flected down the mesentery on to the alimentary organs. This 



