(6) The leg or crus. 



(c) The foot or pes, which is very long, and provided with four 

 clawed digits — the first digit or halluK being abseat. Its 

 sole, or plantar surface, is covered with hair. 



B. The Abdominal Viscera. 



Fix the animal with its ventral surface upwards. Make an incision through 

 the skin over the sternum, and continue it forwards to the mandibular symphysis, 

 and backwards to the pubic symphysis. Dissect carefully the skin from the 

 underlying parts. 



Note the panniculus carnosus, a thin sheet of muscle covering the whole 

 ventral surface of the trunk and neck ; and in the female the mammary glands 

 with their ducts passing to the teats. 



Open the abdomen by a mesial incision from the posterior end of the 

 sternum to the symphysis pubis. From this make transverse cuts on either 

 side along the margin of the ribs. Pin out the flaps and note the following 

 viscera in position. 



(a) The liver, a large dark red body, consisting of several lobes. 



(b) The stomach, immediately behind the liver and partly covered by it. 



(c) The duodenum, long and narrow. 



(d) The small intestine, long, narrow, reddish, and much coiled. 



(e) The caecum, wide, dark in colour, coiled, and marked by a spiral 



constriction, and ending in the vermiform appendix. 

 (/) The colon, with sacculated walls, lying between the folds of the 



csecum, 

 (g) The rectum. 



{h) The urinary bladder, in front of the symphysis pubis. 

 Observe that the peritoneum lines the body cavity, and invests, or 

 extends over, its various contents. 

 Turn the alimentary tract aside in order to expose the following 

 parts : — 

 (i) The spleen, an elongated dark red body behind the stomach, and 



attached to its cardiac end by the gastro-splenic omentum. 

 ( j) The kidneys, lying behind the peritoneum and attached to the dorsal 



wall of the abdomen, the right one being the more anterior. 

 (k) The adrenal bodies, small, round, yellowish structures, one near the 



inner margin of each kidney. 

 (I) The diaphragm, a muscular partition separating the thorax from the 



abdomen, 

 (m) The mesentery, a double fold of peritoneum supporting the alimen- 

 tary canal. 

 (n) The coeliac ganglia, situated in the mesentery, opposite the right 



adrenal body. 



