PRELIMINARY OPERATIONS 



91 



Fig. 92. Insertion of the arterial cannula. The cannnla and tubes contain no solution: 

 this is run in later after the cannula is firmly tied into the artery. 



Posfhon of Exk Juqular V- 



Fig. 93. The cannula is tied into the artery. The right external jugular vein is 

 dissected out by pulling the skin outward while the muscles and fascia are scraped 

 back inward with the probe. The vein lies in the fascia as indicated. 



