Twentieth Century Practice, Vol. 8 of 20
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Produktbeschreibung
Excerpt from Twentieth Century Practice, Vol. 8 of 20: An International Encyclopedia of Modern Medical Science The buccal cavity may be divided physiologically into two regions, which also differ from each other anatomically to a certain degree. The anterior portion, the true buccal cavity, bounded anteriorly by the lips and laterally by the cheeks, is properly merely the beginning of the digestive tract which serves for the reception and the first manipulation of the nutritive material. In it are found the tongue with the organs of taste, the teeth, and the openings of the salivary ducts. There is no sharp dividing line between it and the posterior portion, the pharynx, although the part uniting these two is narrowed by the velum palati above, the arches of the palate laterally, and the epiglottis below to form the "isthmus of the fauces." The pharynx belongs to the respiratory as well as to the digestive system, the two tracts crossing each other in it; by the act of swallowing the digestive canal is shut off from the respiratory tract by the velum palati and constrictors of the palate above, the epiglottis and the muscles surrounding the upper portion of the larynx below, as by valves. At the entrance of the two canals in the pharynx are certain peculiar organs of a texture resembling that of lymph glands, which have been made the subject of much study, especially in recent times, but the significance of which still remains obscure. These organs are the pharyngeal tonsil at the entrance of the respiratory tract, and the lingual and two palatal tonsils at that of the digestive tract. All four structures have been designated together by Waldeyer as the lymphatic faucial ring, since they actually form, in the earlier stages of development, an almost complete ring round the commencement of the fauces. This entire cavity, of such exceedingly complex formation, is still more complicated in its development. For his investigations in this direction His is deserving of great credit. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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