24 ELEMENTARY PHYSIOLOGY. [l. 



the inferior vena cava. Follow the crural nerve 

 up to the spinal cord, it arises chiefly from the 

 5th lumbar nerve (receiving branches also from 

 the 6th and 7th). 



2. Remove the skin from the back of the thigh, cut 

 through the tendonous line seen over the femur 

 and pull the outside mass of muscle outwards, 

 the large sciatic nerve will be seen, trace this 

 to the top of the thigh, then turn the rabbit 

 over and follow the nerve to its origin from the 

 spinal cord; it arises chiefly from the 7th 

 lumbar and 1st sacral nerve (receiving branches 

 from the 6th lumbar and 2nd and 3rd sacral 

 nerves.) 



E. The Student should have a rabbit's and a dog's 

 skull before him, and make out the several 

 openings by which the nerves spoken of below 

 issue from the skull. 



1. Carry up to the chin the median skin cut and 

 reflect the skin, place the head on one side ; just 

 in front and ventrally of the base of the ear will 

 be seen the thin dorsal part of the parotid 

 gland, often much hidden by fat tissue; the 

 gland stretches ventrally a little past the angle 

 of the jaw. 



2. From the anterior border of the parotid gland, 

 issues the greater part of the facial nerve 

 (7th) dividing into several branches which run 



