290 ENDOCRINE GLANDS 



1. Lacrymal glands. 



2. Mucous glands of the nose and the pharyngeal region 

 in the neighborhood of the nose. 



The motor vegetative arc is, therefore, constituted by 

 a central nucleus, the lacrymal mucous -facial nucleus, from 

 which a central ganglionic neuron arises (which follows 

 successively the course of the facial, greater superficial 

 petrosal, vidian) ; a ganglionic nucleus (the spheno-palatin 

 nucleus), from there arises a ganglion-organic neuron, 

 which by a series of branches of the superior maxillary 

 reaches its various endings. 



The afferent sensory arc is represented by the sensory 

 part of the trigeminal. 



C. PHYSIOLOGY OF THE VEGETATIVE SYSTEM ANNEXED TO THE VII. 



The central nucleus is the superior salivary from which 

 arise the vegetative fibres which, by the intermediary 

 nerve of Wrisberg, the corda tympani, the lingual of the 

 trigeminal, reach to the sub-maxillary or maxillary gang- 

 lion which they penetrate. Some fibres end in the ganglion 

 and communicate with the ganglionic fibres, others simply 

 go through it and reach a microscopic ganglion, the 

 ganglion of Langley where they end and anastomose with 

 the ganglionic cells. From the ganglionic cells of the 

 ganglion arise ganglion-organic fibres which reach the sub- 

 lingual gland ; from the cells of the ganglon of Langley also 

 arise ganglion-organic fibres, which reach the submaxillary 

 gland. 7 These ganglion-organic fibres control the secretions 

 of the sub-maxillary and sub-lingual glands. 



The motor arc is, therefore, as follows : central ganglionic 

 neuron from the superior salivary nucleus to the maxillary 

 and Langley ganglia, passing by way of the intermediary 

 nerve of Wrisberg, the corda tympani, the lingual, the two 



7 This is a physiological fact. 



