L'encyclopédie Britannica ; un dictionnaire des sciences, des arts, de la littérature et de l'information générale . ns dont sont vus dans le foramen caecum (voir glandes sans raccordement).on voit que la langue est développé en lien avec la première, deuxième et troisième arches viscérale, et il est donc d'beexpected que les cinquième et neuvième seenth, nerfs qui supplythose arches contribuerait à fournir. mais le nerf vague du fourthjirch l'atteint en outre, bien que le fait que la plupart des muscularsubstance de la langue est fournie par le nerf nerf hypoglosse isexplained sur la théorie que certains de la cer

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The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . ns ofwhich are seen in the foramen caecum (see Ductless Glands).It will be seen that the tongue is developed in connexion with thefirst, second and third visceral arches, and it is therefore to beexpected that the fifth, seenth and ninth nerves which supplythose arches would help to supply it. but the vagus from the fourthjirch reaches it in addition, while the fact that most of the muscularsubstance of the tongue is supplied by the hypoglossal nerve isexplained on the theory that some of the cervical skeletal muscula-ture has grown cephalad into the tongue and has carried its nervewith it.O^- Comparative Anatomy. The tongue is present in fishes but it Ts an immovable swelling inthe floor of the mouth and is practically devoid of muscles. In thehag {Myxine) among the Cyclostomata, and pike (Esox) among the Iniefnal jugu!;il accessory niZ>igastncinuscfe Hypoglossal nerveI Internal catoiid arteryPneumogasinc nerveSynipaihciic Ascending pbar>ng«^l irtcry Odonto d process palatine. OTT. J., , , (from AmLrose Difiolnghain id Cunnlngbams Text Baok of Anaiaky.) .(>i Horizontal Section through Mouth and Pharynx at the Level of the Tonsils. TeTeostet. teeth are developed on the tongue. In the Amphibia, the tailed, forms (Urodcla) usually have tongues like fishes, though in.the genus.Spelerpes the organ is very free and can be protruded for a great distance, in the majority of the Anura the tongue is usually attached close to the front of the floor of the mouth so that it can^ flapped forward with great rapidity. There are, however, two cloisely allied families of frogs (Xenopodidae and Pipidae) which4ortn the order of Aglos&a, because in them the tongue is suppressed..| In the, xcptiles trie tongue is generally very movable, though this is not the Case in the Crocodilia and ma;ny ol the Chelonia. The forked tongues of snakes and many lizards and the highly specialized t

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