RESP1RA T10N. 135 



rupting the respiration by holding the nostrils. 

 What does the phrenogram show? What is the 

 interpretation? 



What effect upon intra thoracic pressure would 

 the holding of the nostrils have? 

 c. The phrenic nerve and its Junction. 



(8) Describe minutely the relations of the nervus 

 phrenicus in the neck. 



(9) Cut the nerve while tracing a phrenogram from 

 the left side of the diaphragm. Note the result. 



(10) Take a phrenogram from the right side of the 

 diaphragm. Does it differ essentially from the 

 normal? 



(11) While taking a left phrenogram stimulate the 

 distal end of the left phrenic nerve. Interpret the 

 result. 



(12) While taking a right phrenogram stimulate the 

 distal end of the left phrenic nerve. Interpret the 

 result. 



(13) Dissect out and cut the right phrenic nerve. 

 Does the diaphragm cease to move? If it moves, is 

 its movement active or passive? Account for the 

 phenomena. 



Kill the animal with chloroform. 



