. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 204 COMPARATIVE ANATOMY after the embryonic period,^ and has plainly undergone a change of function in connection with the perception of the warmth and moisture of the inspired air. When well developed, it forms a single or double coil, and may even be more or less branched (Fig. 164). Branches of the trigeminal extend over it, and supply its mucous mem- brane. An olfactory and a respiratory region can there- fore also be distinguished in the nasal chamber of Mammals. The nasal chamber usually communicates with neighbo
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 204 COMPARATIVE ANATOMY after the embryonic period,^ and has plainly undergone a change of function in connection with the perception of the warmth and moisture of the inspired air. When well developed, it forms a single or double coil, and may even be more or less branched (Fig. 164). Branches of the trigeminal extend over it, and supply its mucous mem- brane. An olfactory and a respiratory region can there- fore also be distinguished in the nasal chamber of Mammals. The nasal chamber usually communicates with neighbour- ing cavities, such as the maxil- lary, frontal, and sphenoidal sinuses (Fig. 163, B, c): the two last-mentioned cavities arise in connection with the. Fig. 163, a.—Lateral View of the ISTasal Chamber or A Hdman Eji- BRYO. /, //, ///, the three olfactory ridges; t, supernumerary ridge whiclr occurs in the embryo; ii, tip of the nose hard palate ; rr, base of skull; Eustachian aperture. OS, nasal apparatus, but may lose their primary func- tion, often persisting merely as air-sinuses. The nasal glands may be divided into two sets, —numerous small, diffuse Bowman's glands, and a large gland of Stenson. The latter appears early in the embryo, and often be- comes greatly reduced later on in development ; it is situated in the lateral or basal walls of the nasal cavity, and may extend into the maxillary sinus when the latter is well developed. The appearance of an external nose is very charac- teristic of the olfactory or- gan of Mammals : this must. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
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