CHAPTER IX 



OPERATIONS ON THE SKULL, FACE, LIPS, AND 

 NOSTRILS 



Trephining-. 



The operation of trephining the skull, nostrils, or face is 

 occasionally resorted to after severe injuries, in order to 



remo\e foreign material 

 from underneath or to 

 raise depressed pieces 

 of bone. It is also of 

 \alue in some dental 

 cases. 



The instruments re- 

 quired are a sharp 

 scalpel, dissecting for- 

 cejjs, arter\- forceps, a 

 curved piece of metal 

 to use as an elevator, 

 a small - sized trephine 

 (Fig. 60), and a strong 

 gimlet. 



Operation. — The ani- 

 mal is secured in the 

 abdominal position and anaesthetized, the hair having been 

 previously remo\'ed b}- shaving from the seat of operation and 

 the parts thoroughly disinfected. A crucial or T-shaped in- 

 cision is made over the spot, and all tissues bet^\•een that and 



88 



Fig. 60. — Trephine. 



