330 HUMAN PHYSIOLOGY 



which joins the lingual, is cut, the reflex secretion does not 

 occur. Stimulation of the chorda tympani causes a copious 

 flow of watery saliva, and a dilatation of the blood vessels of 

 the glands. If atropine has been first administered the 

 dilatation of the vessels occurs without the flow of saliva, 

 indicating that the two processes are independent of one 

 another. The secreting fibres all undergo interruption before 



FIG. 146. Nervous Supply of the Salivary Glands. Par., Parotid, and S.M. and 

 S.L., the Submaxillary and Sublingual Glands; VII. , the Seventh Cranial 

 Nerve, with Ch. T., the Chorda Tympani Nerve, passing to L. t the Lingual 

 Branch of V., the Fifth Nerve, to supply the Glands below the Tongue, T. ; 

 IX., the Glossopharnygeal giving off J.N., Jacobson's Nerve, to the O., 

 Otic Ganglion, to supply the Parotid Gland through Aur. T., the Auriculo- 

 temporal Nerve. 



the glands are reached; the fibres to the sublingual gland 

 having their cell station in the submaxillary ganglion (S.M.G.), 

 the fibres to the submaxillary gland having theirs in a little 

 ganglion at the hilus of the gland (S.M.). This was demon- 

 strated by painting the two ganglia with nicotine. When 

 applied to the submaxillary ganglion it does not interfere 

 with the passage of impulses to the submaxillary gland, but 

 stops those going to the sublingual. 



If, when the chorda tympani is stimulated, the duct of the 



