MOVEMENTS OF OESOPHAGUS AND INTESTINE. 

 THE MOVEMENTS OF THE INTESTINE. 



237 



Demonstration 13. The same animal may now be used for 

 observations on the intestinal movements. For this purpose a 

 tracheal cannula is inserted and artificial respiration established.* 

 The thorax is then opened and the vagus and splanchnic nerves 

 quickly cut, this procedure being necessary in order to secure pro- 



FIG. 70. Sherrington Electrodes. The nerve is pulled through the tube by means of a 

 thread attached to it, and is arranged so that it lies between the platinum electrodes inserted 

 through the side tube. The nerve musto n no i ccount be stretched when being pulled into the 

 electrode 



nounced intestinal movements. One of the splanchnic nerves is 

 connected with Sherrington's electrodes (Fig. 70) the wires of which 

 emerge from the wound. The thoracic wound is closed by sutures, 

 and the abdomen opened along the linea alba. The animal is then 



*It is advisable also to place a cannula filled with saline in the central end 

 of the jugular vein. Through this cannula drugs can subsequently be injected. 



