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 . 7^ ~°i Gfll : C UHiojo, 1 irh. THE SKIN. Ill or blood-vessels, and is therefore a hard, insensible mem-brane, investing the true skin, and protecting it from immediate contact with external objects. Where the frictionor pressure to which it is exposed is very great, it becomesquite thick and horn-like. Thus, on the palms of thehands and the soles of the feet, it is much thicker thanany where else. 249.
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 . 7^ ~°i Gfll : C UHiojo, 1 irh. THE SKIN. Ill or blood-vessels, and is therefore a hard, insensible mem-brane, investing the true skin, and protecting it from immediate contact with external objects. Where the frictionor pressure to which it is exposed is very great, it becomesquite thick and horn-like. Thus, on the palms of thehands and the soles of the feet, it is much thicker thanany where else. 249. The epidermis is marked on the surface by a net-work of lines, which are more numerous and larger nearthe joints, where they form deep wrinkles. It is perforatedby numerous openings or pores, for the passage of hairsand for the perspiratory ducts. {Figs. 1, 2, 3, Pl. IX.) 250. The dermis or true skin is a firm, elastic membrane,composed of innumerable fibres, interwoven in every di-rection by a vast number of blood-vessels, lymphatics,and nerves. 251. Within and beneath the true skin lie the perspira-tory glands, the hair follicles, and the sebaceous or oilglands. Its outer surface is studded with an infinite num-ber
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectphysiologicalprocess
