FUNCTIONS OP THE SALIVARY GLANDS. 



273 



confirmed by further inquiry into the mechanical attributes of 

 the organ. 



Admitting, for the time being, that, as implied by the 

 word "vasodilator," the chorda tympani can dilate the walls of 

 the vessels to which its fibers are distributed, how could it do 

 so and so remarkably increase the blood-flow without the co- 

 operation of the sympathetic fibers? An answer based 



on 



v.sym 



a.car. aj. 



a.sj/m.sm 



r.sm.p. 



ch.t. 



DIAGRAMMATIC REPRESENTATION OF THE SUBMAXILLARY GLAND OF THE 

 Doa, WITH ITS NERVES AND BLOOD-VESSELS. 



"The dissection has been on an animal lying on its back, but since all 

 the parts shown in the figure cannot be seen from any one point of view, 

 the figure does not give the exact anatomical relations of the several 

 structures. 



"sm.gld., The submaxillary gland, into the duct (sm.d.) of which a 

 cannula has been tied. The sublingual gland and duct are now shown. 

 n.L, n.l.', The lingual branch of the fifth nerve; the part n.l. is going 

 to the tongue, ch.t., ch.t.", The chorda tympani. The part ch.t." is pro- 

 ceeding from the facial nerve; at ch.t.' it becomes conjoined with the 

 lingual (n.l.'), and afterward diverging passes as ch.t. to the gland along 

 the duct; the continuation of the nerve in company with the lingual 

 (n.t.) Is not shown, sm.gl., The submaxillary ganglion, with its several 

 roots, a.car., The carotid artery, two small branches of which (a.sm.a. 

 and r.sm.p.) pass to the anterior and posterior parts of the gland, v.sm., 

 The anterior and posterior veins from the gland, falling into v.j., the 

 jugular vein, v.sym., The conjoined vagus and sympathetic trunks. 

 g.cer.s., The upper cervical ganglion, two branches of which, forming 

 a plexus (a.f.) over the facial artery, are distributed (n.sym.sm.) along 

 the two glandular arteries to the anterior and posterior portions of the 

 gland. 



"The arrows indicate the direction taken by the nervous impulses 

 during reflex stimulation of the gland. They ascend to the brain by the 

 lingual and descend by the chorda tympani." (Foster.) 



