REMOVAL OF THE BRAIN 



213 



further back and divide the seventh and eighth nerves as 

 they enter the internal acustic meatus. Below the eighth 

 nerves lie the ninth, tenth, and eleventh nerves. These also 



Anterior and posterior intercavernous sinuses 

 Ophthalmic artery r 

 Internal carotid i 

 Tent. Cerebelli ant. end of 

 attached border 



Tent, cerebelli ant. end 

 of free border 



Spheno-parietal sinus ^ 

 nferior petrosal sinus 



Superior 

 petrosal sinus . 



Middle 



meningeaK 



arters 



Infundibulum 

 ; Diaphragma sellae 

 Optic nerve 



culo-motor nerve 



ucent nerve 

 Trochlear nerve 



Trigeminal nerve 

 Facial nerve 



Acustic nerve 



Sigmoid 

 transverse sinu 



Ligamentum denticulatum ^^^^^^H 

 Occipital sinus 



Transverse sinus 



osso- 



'pharyngeal 

 nerve 



Vagus nerve 



:essory nerve 

 'Hypoglossal nerve 

 'First cervical nerve 

 1 medulla 



FIG. 89. Dissection of the Interior of the Cranium after the removal of the 

 Brain and the Tentorium Cerebelli. 



must be cut ; and the roots of the twelfth nerves, which lie 

 deeper and more medially, must be identified and divided. 

 The pons can then be displaced still further posteriorly and 

 the front of the medulla oblongata will be brought into 

 n146 



