DISSECTION OF THE DOG 



63 



Nn. INTERCOSTAIES. — Running along the intercostal spaces caudal to 

 the vessels, the intercostal nerves are derived from the ventral primary- 

 divisions of the thoracic spinal nerves. Each nerve supplies a lateral cutaneous 

 branch, which was encountered about midway between the vertebral column 

 and the sternum when the thoracic wall was examined from the outside. 

 The termination of each nerve as a ventral cutaneous ramus has also been 

 displayed. 



Vesica felUa 

 Fig. 25. — Outline of the diaphragmatic surface of the liver. 



Dissection.— Th.Q liver may now^v-be removed, but before doing this its 

 lobes and the arrangement of the peritoneum in association with it 

 should be examined. In removing the liver preserve the vena cava as 

 far as possible. 



• LoBi HEPATI3.— Two deep fissures divide the substance of the Uver into 

 three main lobes : a central and two lateral. The central lobe, readily dis- 

 tinguished by its position and the presence of the gall-bladder in association 



