A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . hup, or, again, of considerable length, and deep down inthe subcutaneous connective tissue. The portion of thehair situated in the follicle is the root, that above thelevel of the skin, the .shaft. At the lower extremity oftlie root there is a whitish, soft, bulbous enlargement,the hair bulb, which has a concave end lliat fits upon theconical vascular eminence already mentioned as being thehair papilla. i The hair follicle itself may be divided into three ,acc
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . hup, or, again, of considerable length, and deep down inthe subcutaneous connective tissue. The portion of thehair situated in the follicle is the root, that above thelevel of the skin, the .shaft. At the lower extremity oftlie root there is a whitish, soft, bulbous enlargement,the hair bulb, which has a concave end lliat fits upon theconical vascular eminence already mentioned as being thehair papilla. i The hair follicle itself may be divided into three ,according to its form. From its upper extremity, -whereit opens out upon the surface of the skin, it descends,shaped like a funnel, as far down as the opening of theduct of the sebaceous gland. It then becomes narrowedfor a short distance, but broadens again near the papillato receive the hair bulb. The hair shaft varies considerably in shape, being insome cases round, in others mucli tlattened, or againan,gular. On cross section the hairs are either round, or oval, ortriangular, or square, liaving convex or concave sides. sun. Fig. 5217.—Hair of an Adult at its Point of Emergence from the hai-dened in Muellers fluid and stained with hipma-toxvlin and eosiu. Masinlfled .W diameters. (Aft«r Ralil.) K,Shaft of hair: J. Iniier sheath of root of hair: .til., outersheath of root; T. sebaceous sfland ; -1/, outlet of this gland ; .4 rr.^ariector pill; , stratum corneum ; Stt\^f., stratum Malpijrhii;Str,p., stratum papillare corii; S, sweat glan<l. The augtilar and flattened hairs are found in these locali-ties wliere the hair is curly, the round ones where it isstraight. 564 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. Sklu and Its Ap- At its free external end the hair is pointed when in itsnatural state, but owing to the fact that it is continuallysubjected to mechanical influences, such as rubbing, etc!,it is usually found to have a more or less rounded e
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