File:A text-book on physiology - for the use of schools and colleges - being an abridgment of the author's larger work on human physiology (1866) (14788063413).jpg

Identifier: textbookonphysio00drap (find matches)
Title: A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology
Year: 1866 (1860s)
Authors: Draper, John William, 1811-1882
Subjects: Human physiology Physiology
Publisher: New York : Harper & Bros.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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o the mechanical function thepart has to discharge, the yellow predominating whereelasticity is required, and the white where a resistanceto pressure. The derma also contains organic muscularfibres, to which its property of corrugation, as in cutisanserina, is due. On different parts it is of differentthickness, being thinnest where motion has to be pro-vided for. A deposit of fatty material, lodged beneath,gives it a yielding support. Its outer surface presentsa papillary structure, the instrument of touch. This ismore perfectly developed on the inner surface of thepalm of the hand and fingers. The furrowed aspect ofthe cutis arises from this. A farther consideration ofthe mechanism and functions of the papilla? is deferredto the description of the sense of touch. The photographic engraving, Mg.lS, represents a thinsection of the epidermis of the foot of the dog. The general method of arrangement of the constituentportions of the skin may be gathered from the perpen- Fig. 73. Fig. 74
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Epidermis of dog, magnified 20 diameters. Perpendicular section of skin ofear, magnified 10 diameters. Of what is the true skin composed ? To what is its occasional cor-rugation due? Where is the papillary structure most developed? 206 THE SUDORIPAROUS AND SEBACEOUS GLANDS. dicular section of that of the external auditory meatus inFig. 74 (page 205), a, the derma ; Z>, rete mucosum; c,horny layer of epiderma; d, coil of ceruminous glands;e, their excretory ducts; J\ their apertures; g, hair-sacs;A, sebaceous glands; i, masses of fat. The Sudoriparous Glands originate in depressionsof the cutis or tissues beneath, occurring in some parts,as in the axilla, more numerously than in others. Theyconsist of a tube wound on itself, and sometimes divid-ing in convoluted branches. The knot thus arising iscontained in a cell, the wall of which is copiously sup-plied with blood-vessels: the duct passes through thesuperjacent tissues. The tube is formed of a cylinder ofbasement membrane lined w

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