Animal physiology / by John G. M'Kendrick.

  • John Gray McKendrick
Date:
1877
Catalogue details

Licence: Public Domain Mark

Credit: Animal physiology / by John G. M'Kendrick. Source: Wellcome Collection.

    109/172 page 105
    Fig. 82.—Vertical Section of Skin, shewing a, epidermis; 3, true skin; c, c, hair bulbs ; sebaceous glands opening into hair follicles; e, e, muscles for erecting the hairs. speedily ensue. All the various modifications of epidermis, such as hair, horn, nail, hoof, feathers, &c. may also be regarded in the light of excretions, but space compels us merely to allude to this fact. 151. Functions of the Skin.—The skin is (i) a protective covering for the parts underneath; (2) an organ of excretion; (3) an organ con- nected in certain parts especially with the sense of touch; and (4) partially as an absorptive and respiratory organ, absorbing small quantities of aqueous vapour, and giving olf carbonic acid. Tlie Kidneys, 152. General Description.— The human kidneys are situated in the loins, one on each side of the spine. A well-developed healthy kidney weighs about six ounces. When cut open (see fig. 83), we find a cavity communicat- ing with the ureter^ U, the ex- cretory duct of the kidney, and we observe also that the organ consists of two substances, which are named, from their position, the external or cortical^ and the internal or medullary substance. The medullary part consists of straight tubules, which divide in two as we pass outwards Fig. 83-—Longitudinal Section of Kidney: C, cortical substance ; M, medullary substance; P, pel- vis ; U, ureter; RA, renal artery.
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