1296 



A MANUAL OF ANATOMY 



Relations — Anterior. — ^The pharynx and oesophagus, the common 

 and internal carotid arteries, and internal jugular vein ; the pneumo- 

 gastric nerve, and the gangliated cord of the sympathetic ; the 

 rectus capitis anticus major superiorly ; and the recurrent laryngeal 

 nerve, inferior thyroid artery, and first part of the subclavian 

 artery inferiorly. Posterior. — ^The bodies and discs of the adjacent 

 vertebrae, and their transverse processes. 



Petrous Part of the Internal Carotid Artery.— This part of the 

 internal carotid artery is contained within the carotid canal of the 

 petrous part of the temporal bone. It is at first directed up- 

 wards, and then, describing a bend, it passes forwards and inwards 

 to the foramen lacerum medium, where it enters upon the cavernous 

 part of its course. The vessel is surrounded by small tympanic 

 veins, and is accompanied by the ascending branch of the superior 

 cervical ganglion of the sympathetic nerve. This branch breaks 

 up into two divisions. One of these lies on the outer side of the 

 artery, and gives rise to the carotid sympathetic plexus, whilst the 

 other lies on the inner side of the artery, and goes on to form the 

 cavernous sympathetic plexus. 



Pars Intermedia of Wrisberg 



Geniculate Ganglion 

 Facial Nerve 



Great Superficial Petrosal 



Small Superficial Petrosal 

 Great Deep Petrosal 



Nerve to Stapedius 

 Chorda Tympani 



Great Superf. Petrosal 

 Vidian Nerve 



Spheno-palatine 

 Nerves 



-Meckel's Ganglio 



- Descending Palat 

 Nerves 



Arnold's Nerve _ ; 

 Pneumogastric 



Otic Ganglion 



Internal Carotid Artery and Sympath. Plexus 

 Tympanic or Jacobson's Nerve 



Petrous Ganglion of 

 Glosso-pharyngeal 



Fig. 538. — The Facial Nerve in the Aqueduct of Fallopius, etc. 



(HiRSCHFELD AND LeVEILL6). 



As the artery ascends in the carotid canal it is situated in front 

 of, and below, the tympanum and cochlea ; as it bends it has the 

 Eustachian tube on its anterior and outer side ; and as it passes 

 forwards and inwards it has the Gasserian ganglion above it, the 

 partition between the two being for the most part membranous. 



Branches. — The petrous part gives oH a tympanic branch which 

 enters the tympanum through the posterior wall of the carotid 



