DISSECTION OF THE DOG 



37 



reaches somewhat beyond the edge of the ribs, and is, therefore, visible as 

 soon as the abdomen is opened. 



The spleen may be described as possessing three surfaces, three borders, and 

 two extremities. The lateral surface is applied to the abdominal wall and is 

 consequently convex in a dorso-ventral direction. Since the dorsal part of 

 this surface fits into the groove formed by the vertebral bodies and the ribs, 

 the convexity is most marked in this region. The other two surfaces look towards 



(Esophagus 



Pylorus 



Ductus choledochus 



Ductus 

 pancreaticus 



Ductus pancreaticus acccssorius' 

 Fig. 12. — Outline of the stomach. 



Duodenum 



the median plane and are concave. The more cranial is applied to the stomach ; 

 whereas the more caudal is in contact with the left kidney and the intestines. 



The cranial and caudal borders, bounding the lateral surface, are thin. 

 The medial border is much less prominent, but is important since it is the 

 seat of the hilus of the spleen (hilus lienis), by which the blood-vessels and 

 nerves enter the organ. This border, moreover, has the gastro-lienal ligament 

 (lig. gastro-lienale) attached to it. 



Ventrictjltts. — The stomach is a saccular dilation of the alimentary canal 



D 3 



