. Human embryology and morphology. Embryology, Human; Morphology. 42 HUMAN EMBRYOLOGY AND MOKPHOLOGY. in a series of laminae, recalling and corresponding to the papillae foliatae of low primates and of rodents. Between the papillae foliatae occur taste buds. On the under surface of the tongue at birth, on each side of the sublingual papillae and over the position of the ranine artery, are two fimbriated folds of mucous membrane, the plicae fimbriatae, vestiges of the tongue-like processes of Lemurs and possibly the entire tongue of lowly Vertebrates. Their function and meaning are unknown, but
. Human embryology and morphology. Embryology, Human; Morphology. 42 HUMAN EMBRYOLOGY AND MOKPHOLOGY. in a series of laminae, recalling and corresponding to the papillae foliatae of low primates and of rodents. Between the papillae foliatae occur taste buds. On the under surface of the tongue at birth, on each side of the sublingual papillae and over the position of the ranine artery, are two fimbriated folds of mucous membrane, the plicae fimbriatae, vestiges of the tongue-like processes of Lemurs and possibly the entire tongue of lowly Vertebrates. Their function and meaning are unknown, but they may be connected with the sense of taste. A remnant of the plicae fimbriatae can commonly be seen in the adult. The Lymphatics of the Tongue, the highways for the spread of lingual cancer, run for the greater part with the lingual vein and terminate in the uppermost of the deep cervical glands, over the jugular vein at the angle of the jaw. Many also terminate in the submaxillary lymphatic glands which lie in and around the salivary glands of the same name. The tongue rarely shows any malformation. The Epiglottis.— The origin of the larynx, trachea, bronchi and lungs as a depression and bud from the floor of the pharynx, will be dealt with later (page 256); but the origin at the 3rd week of the furcula (Fig. 34), a process from which the epiglottis is derived, may be noted here. It arises from the 4th visceral arch. The upper part of the thyroid cartilage also arises from the 4th. The superior laryngeal is the nerve of the 4th arch, hence it supplies the epiglottis and upper part of the larynx. upper dental ridge Aub. impar. prim, pharynx. Parotid lower dental ridge lingual nerve sublingual gl. submaxillary gl. Pia. 32 - -Showing the origin of the Submaxillary and Sublingual Glands from furrows between the gum and tongue during the flth week. (After His.) Origin of the Salivary Glands.—Between the tongue and gum of the foetus there are two furrows (Fig. 32). From the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
