THE TRIGEMINAL NERVE. 



1247 



By means of these connections and the branches of distribution from the otic gang- 

 lion, secretory fibres are carried along with those of the auriculo-temporal (page 

 1244) to the parotid gland. The small superficial petrosal nerve also contains taste- 

 fibres, which pass either to the petrous ganglion of the ninth or to the geniculate 

 ganglion of the seventh, and thence centralward to the reception-nuclei in the 

 medulla. 



The motor root is a branch from the internal pterygoid nerve. The sympathetic 

 root is represented by one or two nerve-filaments from the plexus on the middle 

 meningeal artery. The ganglion also receives the sphenoidal branch from the Vidian 

 nerve. 



Branches. — A number of delicate strands pass from the otic ganglion to adja- 

 cent nerves. These so-called branches of distribution include : {a) two or more fila- 

 ments which join the roots of the auriculo-temporal nerve and so convey secretory 

 fibres from the glosso-pharyngeal to the parotid gland, {b) a communicating branch 



Fig. 1065. 



Ophthalmic 



Maxillary 



Ophthalmic 



km Occipitaii 

 ^^V- minor 



Diagrams showing distribution of cutaneous branches of trigeminal and cervical spina] nerves. 



to the chorda tympani and (c) another to the buccal nerve, (^) a branch to the 

 internal pterygoid nerve, and (e) and {/) branches to the nerves supplying the 

 tensor palati and tensor tympani muscles. 



The Submaxillary Ganglion. — The submaxillary ganglion (g. submaxillare) 

 (Fig. 1063) is a reddish triangular or fusiform body, measuring from 2-3 mm. in 

 its greatest length, and is the smallest of the sympathetic ganglia connected with 

 the fifth nerve. It is situated above the deep portion of the submaxillary gland and 

 upon the hyo-glossus muscle and lies between the submaxillary duct and the lingual 

 nerve, apparently suspended from the latter by two short slender filaments. The 

 anterior of these transmits chiefly sympathetic fibres that pass from the ganglion 

 to the lingual nerve, the posterior fibres going from the lingual to the ganglion as its 

 sensory and motor roots. 



Roots. — The sensory root is contributed by the lingual nerve ; the motor root 

 proceeds from the facial by way of the chorda tympani and contains secretory fibres ; 

 and the sympathetic j'oot is derived from the adjoining plexus on the facial artery. 



Branches. — The branches of distribution include: (a) a number of fibres which 

 pass to the submaxillary gland, {b) others which are distributed to the submaxillary 

 duct and the mucous membrane of the floor of the mouth and {c) filaments which join 



