Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . the sense of smell is in the thinand delicate membrane which lines the internal surfacesof the nasal cavities. It is called Schneiderian membrane,from the man who first described its structure. 338. The acuteness of this sense seems very nearly inproportion to the amount of Schneiderian membrane, orto the extent of surface which the nasal cavities present. Hence, in all those animals re-markable for acu
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . the sense of smell is in the thinand delicate membrane which lines the internal surfacesof the nasal cavities. It is called Schneiderian membrane,from the man who first described its structure. 338. The acuteness of this sense seems very nearly inproportion to the amount of Schneiderian membrane, orto the extent of surface which the nasal cavities present. Hence, in all those animals re-markable for acuteness of scent—as the deer, sheep, and dog—the nose is very large, andits internal surface greatly in-creased by the curiously con-voluted form of the internalor turbinated bones. Fig. 52k is a vertical section of the &Jlrc*™Y!-a, moCuTth°;N ^nostril* nasal cavities in man, showing^ef4%r^oLete>,KIoS tow this membrane is increas-^s^;%fv°atof1hUeTaLte:spheuoidal ed in surface by the turbinated bones,/ g, h. 339. When air charged with odorous particles passesover the Schneiderian membrane, in the act of ordinaryrespiration, or in the voluntary efforts of snuffing air, some. How long will musk scent a room without any apparent loss of its particles?What is said of bodies which lose weight by loss of particles? Where isthe special seat of the sense of smell ? What is the membrane called ? Theacuteness of this sense is in proportion to what ? What is said of the size ofthe nose in those animals which are remarkable for acuteness of smell? Howis the interior surface of the nose greatly increased? Explain the manner inwhich the odorous particles are made to act on the Schneiderian membrane] THE SENSES. 163 of the particles come in contact with it, and act upon thedelicate extremities of the olfactory nerves, with which themembrane is thickly set. If this membrane is either toomoist or too dry, the odorous particles make no impressionon it. Thus, in colds or in fevers, the s
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