REMOVAL OF THE BRAIN 



107 



to the divided ends of the internal carotid arteries, and in the 

 median plane, is the infundibulum descending into the hypo- 

 physeal fossa, and more posteriorly, one on each side, are the 

 projecting posterior clinoid processes. The area between the 

 four clinoid processes is partially covered by a fold of the inner 

 layer of the dura mater, termed the diaphragma sellce. It binds 



Superior sagittal sinus 



Falx cerebri 



Optic nerve 



Ophthalmic artery 



Maxillary nerve 



icmilunar ganglio 



tliddle meningeal 

 artery 



osterior cerebral 

 artery 



reat superficial 

 petrosal nerve 



Pedunculus 

 cerebri 



Substantia 

 nigra 



Lamin 

 quadrigemina 



Cerebellum . 



Straight si 



Internal carotid art< 



Infundibulum 



Cavernous sinu 

 .Oculo-motor ne 



--Basilar artery 



ochlear nerve 

 Basal vein 



Transverse sinus 

 Great cerebral vein 



FIG. 35. Interior of the Cranium after the removal of the cerebrum. The 

 transverse, straight, and superior petrosal sinuses have been opened, and 

 the dura mater has been removed from the floor of the left middle fossa. 



down the hypophysis and in its centre is an aperture through 

 which the infundibulum passes to join the hypophysis (O.T. 

 pituitary body), which lies in the hypophyseal fossa in the base 

 of the skull. In the anterior and posterior margins of the 

 diaphragma sellae are lodged respectively the sinus inter- 

 cavernosus anterior and the sinus intercavernosus posterior, 

 which should not be opened at present. 



