416 SPLANCHNOLOGY, OR ANATOMY OF THE VISCERA 



drain into the submaxillary nodes. Those draining the posterior 

 half end in the deep cervical nodes; along the internal jugular 

 vein. Across the anterior two-thirds of the tongue there 

 is no lymphatic connection between the two sides; in the 

 posterior one-third there is free connection, due to absence 

 of the septum here. 



The nerves of the tongue are five in number in each half 

 the lingual, a branch of the inferior maxillary division of the 

 trigeminal innervates the papillae on the sides and anterior 

 part of the tongue; it is the nerve of ordinary sensibility for 

 the anterior two-thirds. The chorda tympani is the nerve 

 of taste for the same region, and accompanies the lingual 

 enclosed in the same sheath; the lingual branch of the glosso- 

 pharyngeal innervates the mucous membrane of the base, 

 sides, and circumvallate papillae, supplying them with sensor 

 and gustatory filaments; the hypoglossal nerve is distributed 

 to the muscular substance of the tongue, supplying them 

 with motor filaments. Sympathetic filaments are furnished 

 from the nervi molles on the lingual and other arteries to the 

 tongue. Some of the nerves end free between the cells of 

 epithelium; others terminate as end organs (Meissner's cor- 

 puscles and the end bulbs of Krause), and in taste buds as 

 sensor dendrites. (Gray.) 



The palate forms the roof of the mouth, and consists of a 

 front part or hard, and a back part or soft palate. The peri- 

 osteum of the hard palate (see Bones) is covered by and 

 intimately connected with the mucous membrane of the mouth. 

 In the middle line is a raphe ending in front at a small papilla, 

 which marks the anterior palatine fossa which receives the 

 terminal part of the anterior palatine and nasopalatine nerves. 

 The mucous membrane is pale and corrugated, covered with 

 squamous epithelium, and furnished with a number of palatal 

 glands which lie between it and the bone. 



The soft palate partially separates the mouth and pharynx. 

 It consists of muscular, connective, and adenoid tissue, with 

 vessels, nerves, and mucous glands, all enclosed in a fold of 

 mucous membrane. Above it is joined to the back of the 

 hard palate; laterally it blends with the pharynx; below it 

 is free; in front it is concave, with a median ridge; and behind 

 it is convex. Its mucous membrane is continuous with that 

 of the roof of the mouth and of the posterior nares. 



