CHAPTER XXXVII. 



THE DECEREBRATE CAT I. 



Demonstration 16. 



A cannula is inserted in the trachea in a deeply etherized cat (preferably a young 

 animal) and a pair of serres fines is placed on the carotid arteries on both sides of 

 the neck. The animal is then placed on the ' decerebrator ' with the 

 pelvis resting on the back platform (P), the hind legs hanging free, and the 

 neck on the neck block (N), care being taken to prevent any kinking of the 



FIG. 72. Decerebrator. For description, see context. 



tracheal cannula. The nasal septum is punctured by a scaplel and a cord is pass- 

 ed through to a hole on the neck block, at the lower level of the tongue guard (T). 

 The mouth is opened and by gentle traction on the cord and manipulation of the 

 head the snout is pulled over the tongue guard which lies over the tongue with its 

 point between the fauces and over the epiglottis. The cord is then tied to a hook 

 on the base of the stand and the nose piece (S) is pressed up against the snout 

 and fixed in position by tightening the clamp. 



An incision is now made along the mid line of the skull and the skin reflected 

 to both sides. A distance of 30 mm. is measured back from the coronal suture 



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