338 



THE SALIVARY GLANDS. 



a tliin process of the glandular substance, round the posterior border 

 of the mylo-hyoid muscle {mh), and then runs forwards and inwards 

 above that muscle, between it and the hyo-glossus and genio-hyo- 

 glossus, and beneath the sublingual gland, to reach the side of the 

 fra^nuni liuguge. Here it terminates, close to the duct of the opposite 

 side, by a narrow orifice, which opens at the summit of a soft papilla (r/) 

 seen beneath the tongue. The obvious structure of this gland is like 

 that of the parotid ; but its lobes are larger, its surrounding areolar 

 ■web is finer, and its attachments are not so firm. Moreover," its duct 

 has much thinner coats than the parotid duct. 



The blood-vessels of tlie submaxillary gland are branches of the facial and 

 lingual arteries and veins. The nerves include those derived from the sub- 

 maxillary ganglion, and through this, doubtless, from the chorda t^inpani, as 

 well as branches from the niylo-hyoid division of the inferior dental nerve, and 

 the sympathetic. 



THE SUBLINGUAL GLAND. 



The sublingual gland (fig. 237), the smallest of the salivary glands, 

 is of a narrow oblong shape and weighs scarcely one drachm. It is 



Fig. 237. Fig. 237.— View of tue Right Sub- 



MAXILLARV AND SUBLINGUAL GlANDS 



rnoii THE Inside (Alien Thomson). 



A part of the riglit side of tlie jaw, 

 di%'ided from the left at the symphysis, 

 remains ; the tongue and its muscles 

 have been removed ; but the mucous 

 membrane of the right side is retained 

 :iiid is drawn upwards so as to expose 

 tlie sublingual glands ; s on, the larger 

 .superficial ivdvi of the submaxillary 

 gland ; /, the facial artery passing 

 through it ; s in', deej) portion prolonged 

 on the inner side of the mylo-hyoid 

 muscle VI h ; s I, is placed below the 

 anterior large part of the sublingual 

 gland, with the duct of Bartholin i^artly 

 shown ; s I', placed above the hinder small end of the gland, indicates one or two of 

 the ducts perforating the mucous membrane ; d, the papilla, at which the duct of 

 Wharton opens in front behind the incisor teeth ; d', the commencement of the duct ; 

 h, the hyoid bone ; n, the gustatory nerve. 



situated along the floor of the mouth, where it forms a ridge between 

 the tongue and the gums of the lower jaw, covered only by the mucous 

 memln-ane. It reaches from the fra3num lingua?, in front, where it is 

 in contact with the gland of the opposite side, obliquely backwards and 

 outwards for rather more than an inch and a half. On its inner side it 

 rests on the genio-hyo-glossus ; beneath, it is su]:)ported by the mylo- 

 hyoid muscle (mh), which is interposed between it and the main part 

 of the submaxillary gland ; but it is here in close contact with the 

 Whartonian duct, with the accompanying deep portion of the last-named 

 gland, and also with the lingual branch of the fifth pair of nerves. 



The lobules of the sublingual gland are not so closely united together 

 as those of the other salivary glands, and the ducts from many of them 

 open separately into the mouth, along the ridge which indicates the 

 position of the gland. These ducts, named ducts of Riviiius, are from 

 eight to twenty in number. Some of them open into the duct of 



