304 



VETERINARY PHYSIOLOGY 



parotid gland is supplied by the auriculo-temporal division 

 of the fifth and by sympathetic fibres (fig. 149). 



(a) The influence of these nerves has been chiefly studied 

 on the submaxillary and sublingual glands. 



(1) It has been found that, when the lingual nerve is cut, 

 the reflex secretion of saliva still takes place, but that, when 

 the chorda tymiyani {Gh.T.), a branch from the seventh nerve, 

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



Fig. 149. — 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., 

 the lingual branch of F. , the fifth nerve, to supplj' the glands below 

 the tongue, T. ; IX., the glossopharyngeal giving o& J.N., Jacobson's 

 nerve, to 0., the otic ganglion, to supply the parotid gland through 

 Aur.T., the auriculo-temporal nerve. 



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. 

 This indicates that the two processes are independent of one 

 another. 



The secreting fibres all undergo interruption before the 

 glands are reached ; the fibres to the sublingual gland having 

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



