File:The human body. A beginner's text-book of anatomy, physiology and hygiene (1884) (14596462279).jpg

Identifier: humanbodybeginne00mart (find matches)
Title: The human body. A beginner's text-book of anatomy, physiology and hygiene ..
Year: 1884 (1880s)
Authors: Martin, H. Newell (Henry Newell), 1848-1896 Martin, Hetty Cary, (from old catalog) joint author
Subjects: Physiology
Publisher: New York, H. Holt and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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broider a pattern on your hand without causing pain.ordrawing blood. But if the point of the needle entersthe dermis, you feel the prick, and a drop of blood isvery likely to floAV from the wound. 5. How the Epidermis is Shed and Renewed.—If you haveever seen an old brick house, you may have noticed that thebricks on the outside of the wall are worn away, crumbly,easily broken, and the mortar between them loose; whilethe bricks and mortar which lie deeper in the wall andhave not been exposed to the weather, are perfectlysound. The epidermis (Fig. 21) is made up of millions 3. How may we learn from a blister which layer of the skin is sen-sitive ? How discover which contains blood ? 4. How may we in another way observe the same facts ? 5. What might you notice on an old brick house? How do itswalls resemble the epidermis ? Of what is the epidermis made up ? EPIDERMIS. 6i of little pieces, called ce//s, joined together by a sort ofglue. The cells may be compared to the bricks, and the
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i^^a Fig. 21.—A thin slice of epidermis, greatly mag-nified. a, the outer or horny layerof the epidermis, made of old dry cells; ^, the deeper moist layer of the epidermis,made of living growing cells; ci, the deepest row of epidermic cells, lying next thedermis; <:, the uppermost layer of the dermis; (it is seen to be elevated to form apapilla in which is a tuft of tubes,y, ^, containing blood;) /t, the duct of a sweat-gland. glue to the mortar, of a wall. Each cell is so small thata powerful microscope would be needed to see one by 62 COMPLEXION, itself, but, cemented together in thousands, they makeup the tough epidermis, as we see it covering a blister.The cells, a^ near the surface, exposed to the air and towear and tear from rubbing against the clothes andother things, become different from the deeper cells, b.The outside part of the epidermis is in fact dead, and isbeing constantly shed and got rid of. Sometimes manycells come off together, as seen in the *^ peeling* of th

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