228 



THE HEAD AND NECK 



After the membranes have been opened, a director is passed 

 into the substance of the cerebellum at the point where the 

 bulging is greatest. The instrument must not be passed in 



70. Cranio-Cerebral Topography. The figure shows the positions of 

 the motor and sensory areas and their relations to Chiene's lines. 



G. 

 O. 

 M. 

 T. 

 S. 

 E. 

 P. 

 N. 

 R. 

 C. 



Glabella. 



External occipital protuberance. 

 Mid-point between G and O. 

 Mid-point between M and O. 

 Mid-point between T and O. 

 Zygomatic process of frontal. 

 Pre-auricular point. 

 Mid-point of EP. 

 Mid-point of PS. 

 Mid-point of AB. 



CD is drawn parallel to AM. 



Z. Post-auricular point. 



VW. Guide to anterior limit of transverse 



sinus. 



Y. Tympanic antrum. 

 X 1 . Site nt which sub - arachnoid space 



may be opened. 

 X 2 . Site for draining lateral ventricle 



(Kocher). 

 X 3 . Site for draining lateral ventricle 



(Keen). 



for more than i J inches, and it may be withdrawn and reinserted 

 in different directions till the pus is found. 



The Lateral Surface of the Cerebral Hemisphere. 

 The Central Sulcus (of Eolando) crosses this surface of the 



