28 



THE IN VOL UNTAR Y NER VO US S YSTEM 



C.G 



To lachrymal 

 gland, 



Topalate 

 # nose 



Toparofcid 

 gland 



S.&G 



C.T. 



FIG. 6. THE CONNECTOR FIBRES (BLACK) AND EXCITOR NEURONS (RED) OF THE 

 INVOLUNTARY SYSTEM IN THE UPPER CRANIAL REGIONS. 



A. The prosomatic group. 



B. The upper part of the mesosomatic group. 



A. The prosomatic group consists of connector fibres running in the third nerve 

 to the ciliary ganglion, C.G., in which lie the excitor neurons whose processes run 

 in the short ciliary nerves, C.N., to the ciliary muscles of the eye. 



B. Three groups of connector fibres exist. 



1. A group of connector fibres running in the seventh nerve to the spheno- 

 palatine ganglion, S.P.G., by way of the great superficial petrosal nerve, G.S.P.N. 

 These connect with excitor neurons in the spheno-palatine ganglion, one group of 

 which run in the zygomatic nerve, Z.N., to the lachrymal gland, the other group of 

 which run in the palatine nerves, P.N., to unstriped muscles and glands in the 

 region of palate and nose. 



2. A group of connector nerves which run in the seventh nerve, then pass into 

 the chorda tympani, C.T., and reach a submaxillary ganglion, S.M.G., byway of 

 the lingual nerve, L.N. The excitor neurons lie in the submaxillary ganglion and 

 supply secretory fibres to the submaxillary gland. 



3. A group of connector fibres which run in the ninth nerve and pass by way of 

 the nervus tympanicus, N.T., and the lesser superficial petrosal nerve, L.S.P.N., 

 to the otic ganglion, O.G. The excitor neurons in the otic ganglion run in the 

 auriculo-temporal nerve, A.T.N., to the parotid gland. 



