File:The essentials of health. A text-book of anatomy, physiology, hygiene, alcohol, and narcotics (1892) (14756553826).jpg

Identifier: essentialsofhea00stow (find matches)
Title: The essentials of health. A text-book of anatomy, physiology, hygiene, alcohol, and narcotics
Year: 1892 (1890s)
Authors: Stowell, Charles H(enry), 1850- (from old catalog)
Subjects: Physiology
Publisher: New York, Boston (etc.) Silver, Burdett & company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 108. Transversesection of the frameworkof the nose : (1) the nasalcavities. On the outsideof each cavity are thecurved turbinated bones ;(2) the bones forming theroof of the mouth and thefloor of the nasal cavities.The black represents thebone, the lighter shaderepresents the mucousmembrane covering thebone. The inside of each, orthe side toward themedian line, is smooth,because the septum it-self is smooth ; but theoutside is most irregu-lar, owing to the pres-Fig. 109. The outside of the left nasal ence of three curved cavity, showing the three turbinated bone. _ _ o^roll-like h 011 e S called the turbinated bones. These are w^ell shown, asviewed from the side, in Fig. 109. Lining each nasal
Text Appearing After Image:
312 THE ESSENTIALS OF HEALTH. cavity is a mucous membrane, which is especially thickover the turbinated bones. The Olfactory Nerve. The nerve of smell is called theolfactory nerve. It arises from the lower and front partof the brain, and passes down through minute openingsin the skull just beneath it. Its fine fibers are distrib-uted to the upper half of the mucous lining of thenose; therefore only this part of the nasal cavity hasthe sense of smell. The lower half is endowed with ordinary sensibility sothat, when irritated inany way, it causes thereflex act of sneezing. The Sense of Smell. Weknow little about theaction of odorous bodies ;we cannot see an odor,neither can it be meas-ured. Musk has beenplaced in an open dish ina room for many months,during which time it wasconstantly giving off apowerful odor, yet itsweight was not diminishedduring the entire time.We simply know that certain substances give off a gas-eous or vaporous material; that this material pervadesthe surrounding

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