Archive image from page 1161 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 1128 THE DIGESTIVE SYSTEM. central part (1 to 2-5 mm. wide), slightly tapering towards its base, and flattened on its crown, which projects a little above the general surface of the tongue. This is surrounded by a deep, narrow, circular trench or fossa, the outer wall of which is known as the vallum. The vallum appears in the form of an encircling. collar very slightly raised above the adjacent surface (Fig. 891). As in the case of the other forms, th
Archive image from page 1161 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 1128 THE DIGESTIVE SYSTEM. central part (1 to 2-5 mm. wide), slightly tapering towards its base, and flattened on its crown, which projects a little above the general surface of the tongue. This is surrounded by a deep, narrow, circular trench or fossa, the outer wall of which is known as the vallum. The vallum appears in the form of an encircling. collar very slightly raised above the adjacent surface (Fig. 891). As in the case of the other forms, the vallate papillae are made up of a central mass of corium, beset with numerous microscopic papillae on the crowns, but not on the sides, and covered over, as are the surfaces of the fossa and vallum, by stratified squamous epithelium. Into the fossae open the ducts of some small serous glands (Fig. 891 A). On the sides of the vallate papillae, as well as upon the opposed surface of the vallum, are found, in consider- able numbers, the structures known as taste-buds, the special end-organs of the nerves of taste. Just anterior to the glosso- palatine arch, on the margin, are usually seen about five or six dis- tinct vertical folds, forming the folia linguae, which are beset with taste-buds. They correspond to the papillae foliatae on the side of the tongue in certain animals (rabbit, hare, etc.), in which they form an important part of the organ of taste. The apex and the margin of the tongue in front of the attach- ment of the glosso-palatine arch are free, and lie in contact with the teeth when the tongue is at rest. The philtrum Anterior gland of tongue Layer of muscle cut to show the gland Plica fimbriata Frenulum linguse Duct of the submax- illary gland Openings of ducts of the submaxillary gland Sublingual gland Plica sublingualis, with openings of ducts of sublingual gland On the superior half or more of the margin and apex, papillae are present as on the dorsum ; but
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