THE RABBIT. 125 



5. Find the medulla oblongata, which is the part 

 of the brain within the skull that is continuous with 

 the spinal cord. 



6. In front of the cerebrum, find the two olfactory 

 lobes. 



7. Lift up the front of the brain and see the cra- 

 nial nerves. Find the optic nerves and trace them to 

 the eyes. Do the nerves cross? 



8. How many pairs of cranial nerves can you 

 discover? 



Spinal Cord. 



1. Cut through the vertebrae, unroofing the cavity 

 in which the spinal cord lies. See the covering of the 

 spinal cord. 



2. See the roots of the spinal nerves. Notice that 

 the nerves go off in pairs, a right and a left, and that 

 each nerve has two roots, an anterior and a posterior, 

 or upper and lower. 



3. Find a ganglion, on the posterior root just be- 

 fore it joins the anterior one. 



4. Inside the body cavity, between the ribs, look 

 for continuations of the spinal nerves. How many 

 pairs of spinal nerves can you discover? 



5. Find the large nerves that go to the fore legs. 

 Notice the size of the spinal cord at the place in which 

 these nerves originate. 



6. Find the large nerves that go to the hind legs. 

 The principal nerve down the leg is the sciatic nerve. 

 Trace it. 



The Legs. 



1. Separate from the body the entire skeleton of 

 the fore leg, including the shoulder blade. Is it con- 

 nected by a joint to the backbone? What holds it in 

 place ? 



2. Clean all the muscle away from the bones. 



3. Identify and draw all the bones you can find. 



