THE PHARYNX 419 



lies at the side of the frenum lingwe and against the inner 

 surface of the lower jaw, beneath the mucous membrane. 

 It is almond-shaped, weighs 1 dram, and its ducts (of Rivini), 

 ten to twenty in number, open separately, one or two joining 

 to form the duct of Bartholin, which joins Wharton's duct. 

 It is in relation below with the mylohyoid; in front, with its 

 fellow and the lower jaw; behind, with the submaxillary gland; 

 internally the gustatory nerve and Wharton's duct separate 

 it from the geniohyoglossus. 



The arteries supplying the parotid gland, are derived from 

 the external carotid, and the branches given off within its 

 substance; the blood supply of the submaxillary gland is from 

 the facial and lingual; the sublingual gland from the sublingual 

 artery, a brajich of the lingual, and the submental, a branch 

 of the facial artery. The veins of the parotid empty into the 

 external jugular; those from the submaxillary gland open into 

 the facial and lingual; the veins from the sublingual gland 

 open into facial and lingual through the submental and sub- 

 lingual veins. The lymphatics of the parotid drain into the 

 external jugular and the upper deep cervical nodes; the sub- 

 maxillary into the submaxillary nodes; the sublingual lymphatics 

 drain into the submental nodes, and the efferents pass to the 

 submaxillary nodes. The nerves of the parotid gland are the 

 auriculotemporal, nervus intermedius, great auricular, and 

 from the sympathetic plexus found on the external carotid 

 artery; the innervation of the submaxillary is from the chorda 

 tympani and lingual (a branch of the inferior maxillary divi- 

 sion of the trigeminus), through the submaxillary ganglion 

 and its sympathetic filaments; the sublingual is supplied by 

 branches from the lingual nerve, and sympathetic filaments, 

 derived from the chorda tympani through the sublingual 

 plexus. The sympathetic filaments are all efferent. 



THE PHARYNX 



The pharynx is a musculomembranous tube, conical in 

 shape, between the oral cavity and the esophagus; communi- 

 cating with the posterior nares, the oral cavity, the larynx, 

 the two Eustachian tubes, the esophagus. It is attached above 

 to the periosteum of the petrous portion of the temporal bone 



