TEOCHLEAE NERVE. 



motor nerve and the ophthalmic division of the trigeminal nerve. It enters the 

 orbit above the muscles of the eyeball, and terminates in the orbital (superior) 

 surface of the superior oblique muscle. 



Communications. In the cavernous sinus the nerve receives (1) a communicating 



Olfactory bulb 



Optic nerve 



Optic chiasma 



terior cerebral 



artery 



[iddle cerebral 



artery 



Posterior 



:ominuni- 



i ng artery 



alo-motor 



nerve 



: 'rior cere- 



ral artery 



i 'rior cere- 



lar artery 



Trochlear 



nerve 



i ucens 

 nerve 



G sopharyn- 

 geal nerve 



Vagus nerve 

 Accessory nerve 

 Hypoglossal nerve 



Transverse sinus/ 

 Vertebral artery 



Spinal medul 

 Openings of occipital sinus 



Infra-trochlear nerve 

 Supra-trochlear nerve 

 Oculo-motor nerve 



Spheno-parietal sinus 

 Ophthalmic vein 



Anterior clinoid 

 process 



Trochlear nerve 



Oculo-motor 

 nerve 



Abducens nerve 



Circular sinus 

 Ophthalmic nerve 



Maxillary nerve 



Mandibular nerve 



Cavernous sinus 

 Basilar plexus 

 Semilunar 

 ganglion 

 Basilar 

 artery 

 Inferior 

 petrosal 

 sinus 



Vertebral 

 artery 



Sigmoid 

 sinus (part 

 of trans- 

 verse sinus) 



Transverse sinus 



Tentorium cerebelli 

 (cut) 



Occipital sinuses 



Inferior sagittal sinus 

 Confluens sinuum 



Superior sagittal sinus 

 Falx cerebri (cut) 



FIG. 647. THE BASE OF THE SKULL, to show the dura mater, sinuses, arteries, and nerves. 



)h from the cavernous or carotid plexus on the internal carotid artery, and (2) a 

 slender filament from the ophthalmic division of the trigeminal nerve. 



NERVUS TRIGEMINUS. 



The fifth or trigeminal nerve arises from the inferior surface of the pons 

 n its lateral part by two roots, a large sensory root and a small motor root 

 Fig. 643, p. 768). The two roots proceed forwards in the posterior fossa of the 

 >kull, and piercing the dura mater beneath the attachment of the tentorium 

 Cerebelli to the superior angle of the petrous part of the temporal bone, enter 

 i cavity in the dura mater (cavum Meckelii) over the apex of the petrous bone. 



