SALIVARY GLANDS 



27 



The distinction between albuminous and mucous glands 

 becomes definite only when applied to individual cells. A 

 series of glands might be gathered, showing every gradation 



FIG. 1 



v.sym 



n.sym.sni. 



r.sn.p. 



Diagrammatic representation of the submaxillary gland of the dog, 

 with its nerves and bloodvessels. 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. (Foster.) 



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

 has been tied; the sublingual gland and duct are not 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/, ch.t.", the chorda tympani; the part ch.t' '. is proceeding from 

 the facial nerve; at ch.t'. it becomes conjoined with the lingual .?/, and 

 afterward diverging, passes as ch.t. to the gland along the duct; the con- 

 tinuation of the nerve in company with the lingual n.l. 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 con- 

 joined vagus and sympathetic trunks; g.cer.s., the upper cervical gan- 

 glion, two branches of which forming a plexus (a./.) 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. 



