Mammalia / by Frank Evers Beddard.

  • Frank Evers Beddard
Date:
1902
Catalogue details

Licence: Public Domain Mark

Credit: Mammalia / by Frank Evers Beddard. Source: Wellcome Collection.

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    HAIR reduced to as few as two bristles on the lips. The term “ hair/5 however, is apt to be somewhat loosely applied; it has been made use of to describe, for example, the slender processes of the Fig. 1.—A, Section of human skin. Co, Dennis ; D, sebaceous glands ; F, fat in dermis ; G, vessels in dermis ; GP, vascular papillae ; II, hair ; N, nerves in dermis ; NP, nervous papillae ; Sc, horny layer of epidermis ; SD, sweat gland ; SI)1, duct of sweat gland ; SM, Malpighian layer. B, Longitudinal sec¬ tion through a hair (diagrammatic). Ap, Bandof muscular fibres inserted into the h dr-follicle ; Co, corium (dermis) ; F, external longitudinal ; F1, internal cir¬ cular, fibrous layer of follicle ; Ft, fatty tissue in the dermis ; GH, hyaline membrane between the root-sheath and the follicle ; HBD, sebaceous gland ; IIP, hair-papilla with vessels in its in¬ terior ; M, medullary substance (pith) of the hair ; 0, cuticle of root-sheatli ; R, cortical layer ; Sc, horny layer of epidermis ; Sell, Hair shaft ; SM, Mal¬ pighian layer of epidermis ; IRS', IRS1, outer and inner layers of root-sheatli Anatomy.) B (From Wiedersheim’s Comparative chitinous skin of the Crustacea. It will be necessary, therefore, to enter into the microscopical structure and development of the mammalian hair. Hair is found in every mammal. The first appearance of a hair is a slight thickening of the stratum Malpighii of the epidermis, the cells taking part in this being
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