948 



THE NERVOUS SYSTEM 



pani, the larger branch, which extends to join and contribute its quota of fibres 

 to the hngual nerve, a branch of the trigeminus. 



In the internal auditory meatus, the glosso-palatine gives two delicate 

 collaterals to the vestibular nerve, and some filaments (visceral motor probably) 

 are described as given to the auditory artery and to the temporal bone. 



A small geniculo-tympanic branch is given, in the facial canal, from the geniculate ganglion 

 to the small superficial petrosal nerve. This is probably all visceral motor and sympathetic 

 fibres (fig. 7-il). 



There may occur a twig arising from or near the beginnmg of the chorda tympani and form- 

 ing a communication with the auricular branch of the vagus. 



A large part of the great superficial petrosal nerve is formed of glosso-palatine fibres. 

 This nerve is further described below in its relation to the spheno-palatine ganglion. It arises 

 from the anterior angle of the geniculate ganglion, enters the middle fossa of the cranium through 



Fig. 741. — Diagram of the Glosso-palatine Nerve (Black) and the Relations of the 

 Gangliated Cephalic Plexus to other Cranial Nerves. (After Bean.) Broken lines, 

 motor; continuous lines, sj-mpathetic; glosso-palatine in solid black. Medial view. Left 

 side. 



Facial nerve 



Geniculo-tym- 

 panic branch 



Ramus tubse 4-«-------«- 



Tympanic nerve 

 Inferior carotico- 

 tympanic nerve' 

 Vagus nerve' 

 Glosso-pharyngeal nerve 



Internal carotid nerve 

 Jugular nerve 



Superior cervical 

 sympathetic ganglion 



Carotid 

 . artery Oculomotor nerve 



Ciliary 

 ganglion 



ophthalmic nerve 



, -r Maxillary nerve 



-\-f>s" — Mandibular nerve 



-X A(Si^!5l^!?^ Great deep 



J ■ \ \ ^^^^^y^ petrosal nerve 



Sphenopalatine 



ganglion 

 Palatine portion of 

 glosso-palatine nerve 



Nerve of pterygoid 

 canal (Vidian nerve) 



Otic ganglion 



Middle meningeal 

 . , artery 



Chorda tympani 



Submaxillary ganglion 



External maxillary 

 artery 



the hiatus Fallopii, and passes beneath the semilunar ganglion into the foramen lacerum, where 

 it joins with the great deep petrosal nerve to form the Vidian nerve. Thence the glosso- 

 palatine portion passes over or through the spheno-palatine ganglion to form the greater part 

 of the small and middle palatine nerves which are distributed to the epithelium and glands of 

 the soft palate, some of the sensory fibres probably terminating in the taste organs found there; 

 the remainder serving as fibres of general sensibility. It is probable that most of the motor 

 glosso-palatine fibres in the great sui)erficial petrosal nerve terminate in the spheno-palatine 

 ganglion; some may pass to the carotid plexus and to small ganglia elsewhere. 



The chorda tympani consists to a very large extent of sensory fibres (peripheral processes 

 of the cells of the geniculate ganglion), but it also contains motor fibres and is thus also a mixed 

 nerve. It leaves the trunk of tlie facial ikm'vc a short distance above the stylo-mastoid foramenj 

 and pursues a slightly recurrent cour.se upward and forward in the canaliculus chord* tympani 

 (iter chordie posterius), a minute canal in the posterior wall of the tympanic cavity, and it 



