PRACTICE DISSECT IOX 



I!).'! 



located. Could you pass a large needle in at the median 

 incision in the neck and then push it out through the tis- 

 sues in the side of the neck in such a manner as to in- 

 clude both the jugulars on one side in a ligature threaded 

 through the eye of the needle? If you should thus tit 1 a 

 ligature loosely around a portion of the tissues in the 

 side of the neck (including both veins), and then should 

 lift up with a moderate degree of pressure on the ligature, 

 what effect would this have on the back How of blood 

 through the veins to the heart? How much pressure does 

 it take to shut off the flow through a vein? Carry your 



Cervical nerves 



Diaphragm 



Vaqo 



symp. 



trunk 



Cervical 

 vertebrae 



Fig. 182. Schematic representation of the origin, course and distribution of the right 

 phrenic nerve in a dog. (The origin varies in different animals.) 



dissection well down on to the longus colli muscle in the 

 right side of the neck (Fig. 184) and find the right verte- 

 bral artery. Pass a large aneurism needle under the ves- 

 sel, lift it up and slip a ligature around it. What is the 

 distribution of this vessel? Could you inject a solution 

 from a hypodermic syringe into this vessel toward the 

 head? How long a space would you have to operate on 

 the vessel? If you do not find it readily, pick up the right 

 subclavian artery and find the vertebral from this. Could 

 you make the dissection icitlwiit getting into the chest cav- 



