Human anatomy, including structure and development and practical considerations . f these structures, therefore, manifest themselvesin the mouth. The submaxillary gland, however, lies partly beneath the poste-rior border of the mylo-hyoid. Accordingly, disease of this gland is apt to showmost markedly beneath the jaw (Fig. 267, page 247). Ludwigs angina (page553) may spread to the loose connective tissue between the mylo-hyoid muscleand the mucous membrane of the floor of the mouth. That membrane is reflectedfrom the under surface of the tongue to the alveoli and is divided anteriorly bythe fr
Human anatomy, including structure and development and practical considerations . f these structures, therefore, manifest themselvesin the mouth. The submaxillary gland, however, lies partly beneath the poste-rior border of the mylo-hyoid. Accordingly, disease of this gland is apt to showmost markedly beneath the jaw (Fig. 267, page 247). Ludwigs angina (page553) may spread to the loose connective tissue between the mylo-hyoid muscleand the mucous membrane of the floor of the mouth. That membrane is reflectedfrom the under surface of the tongue to the alveoli and is divided anteriorly bythe frenum linguae. On either side of this may be seen the ridges indicating thesituation of the sublingual glands, and close to the frenum at the inner end of theridge the papillae at the opening of Whartons ducts, into which a fine probe maybe passed (Fig. 1352). The inelastic character of the walls of the latter should beremembered as explaining in part the intense pain caused by an impacted submax-illary calculus. This is also in part due to the close relation of the duct to the. ,—- —Anterior lingual Cut surface ofmucous membrane —LiuKual vein—Lingual artery Submaxillary duct—Sublingual gland Dissection of under surface of tongue and sublingual space;mucous membrane removed and tongue drawn upward and for-ward from mouth. 1594 HUMAN ANATOMY. lingual nerve. The relation of that nerve to the floor of the mouth posteriorlyhas already been described (page 1249). The fold of mucous membrane constituting the frenum may be abnormallyshort and prevent the free movements of the tongue, interfering with sucking duringinfancy and with articulation later. When its division is necessary, it should be cutthrough close to the jaw, and with blunt-pointed scissors directed away from thetongue so as to avoid the ranine veins which may be seen close to it on the undersurface of the tongue. The ranine arteries lie farther out and are more deeply situated, being placedbeneath two convergin
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