REMOVAL OF THE BRAIN 



in 



root of the first cervical nerve may be distinguished. At a 

 higher level, on each side, the two rootlets of the hypoglossal 

 nerve pierce the dura, as they pass into the hypoglossal canal 

 (O.T. anterior condyloid foramen). The spinal root of the 



Anterior and posterior intercavernous sinuses 



Ophthalmic artery ! 



Internal carotid t 1 



Tent, cerebelli, ant. end of 



attached border 



Tent, cerebelli, ant. end J ' 

 of free borde 



Spheno-parietal sinu 

 Inferior petrosal sinus 



Superior 

 petrosal sinus 



Middle 



meningeal 



artery 



Infundibulum 

 : Diaphragma sellae 

 , Optic nerve 



ilo-motor nerve 

 Abducent nerve 



Trochlear nerve 



Trigeminal nerve 

 Facial nerve 



^Acoustic nerve 



Sigmoid part 

 transverse sinus 



Basilar plexus 



agus nerve 



Vertebral artery 



Ligamentum denticulatun 



Occipital sinus 



Transverse sinus 



FIG. 36. Dissection of the Interior of the Cranium after the removal of the 

 brain and the tentorium cerebelli. 



Accessory nerve 

 ypoglossal nerve 

 > First cervical nerve 



Spinal medulla 



accessory nerve passes through the foramen magnum into the 

 cranium posterior to the ligamentum denticulatum, and, 

 turning laterally over the margin of the foramen magnum it 

 joins the cerebral fibres of the accessory and the vagus nerves, 

 with which it passes through an aperture in the dura opposite 

 the jugular foramen. Immediately above the accessory and 



