in 



415 



f- 



THE STUDENT'S GUIDE 



TO 



SURGICAL ANATOMY, 



CHAPTER I. 

 SURGICAL ANATOMY OF THE CRANIAL REGION. 



Regions. The regions into which the cranium is di- 

 vided for the sake of surgical reference, differ in number 

 and extent in the various works upon the subject ; thus 

 some make four viz., the occipito-frontal, the temporal, 

 the auricular, and the mastoid ; but for simplicity and 

 more ready reference the following would seem to suffice, 

 viz., the occipito-frontal and the temporo-parietal. The 

 external investment of the cranium or scalp varies in 

 structure in these several regions, and will be considered 

 in the dissection of each. 



The occipito-frontal region is oblong in shape. Its 

 limits are anteriorly, the anterior margins of the roofs 

 of the orbits, and the articulations of the frontal with 

 the superior maxillary and nasal bones ; posteriorly, by 

 the superior curved line of the occipital bone, and on 

 each side by the temporal ridge. 



Dissection. An incision is to be made, commencing 



2 



