THE PIGEON. 225 



blood from the left side and anterior edge of the gizzard 

 to the left lobe of the liver. 



197. The coccygeo-mesenteric or inferior mesen- 

 teric vein (Fig. 54, c.m.r), a large trunk, running in the 

 mesorectum, parallel to the intestine, and receiving veins 

 from the cloaca and rectum : it anastomoses at its dorsal 

 or posterior end with the renal pDrtal veins (see 218), 

 and at its anterior end joins the portal vein ( 194). 



XXIX. Tie a double ligature round the portal vein 

 (the bile ducts may be included), and cut it 

 between the ligatures : if the specimen is injected, 

 the vein may be cut without tying : cut through the 

 gastro-hepatic omentum, and turn the liver over to 

 the right : note : 



.198. The proventriculus, a pink, ovoidal body with 

 thick glandular walls, lying immediately in front of the 

 gizzard (see 204), and to the dorsal side of the heart and 

 liver. 



199. The spleen, a small, ovoidal, red body, attached 

 to the right side of the proventriculus by a fold of 

 peritoneum, the gastro-splenic omentum. 



200. The cceliac artery, seen emerging from between 

 the right lobe of the liver and the proventriculus ; its origin 

 from the dorsal aorta is best observed later ( 228) : it 

 supplies the proventriculus, gizzard, liver, and part of the 

 intestine. 



The coeliac divides into two chief trunks: one, the anterior gastric, 

 sends small branches forward to the proventriculus, and then proceeds 

 to the left side of the gizzard ; the other, the gastro-duodenal, supplies 

 the right side of the gizzard, the duodenum, and the last loop of the 

 ileum. 



201. The gastric branch of the vagus, a delicate nerve on the 

 anterior face of the proventriculus, parallel to its artery, and passing 



backwards to the gizzard. 



Q 



