File:The cat - an introduction to the study of backboned animals, especially mammals (1881) (19965691113).jpg

Title: The cat : an introduction to the study of backboned animals, especially mammals
Identifier: catintroduction00miva (find matches)
Year: 1881 (1880s)
Authors: Mivart, St. George Jackson, 1827-1900
Subjects: Cats; Anatomy, Comparative
Publisher: New York : Scribner's
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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24 THE CAT. (CHAP. II. The root, or bulb, of each hair consists of the dermal sac with its enclosed papilla and the epidermal formation which lines the sac and invests the papilla. It is considerably larger than the diameter of the hair it developes. The cat's whiskers are simply hairs of great size, the bulbs of which are well furnished with blood-vessels and nerves. Hairs are inserted obliquely into the skin, but can be made to stand up, or "on end"—as notably on the cat's tail when the animal is enraged—by means of the contraction of small muscular fibres which pass from the skin to the hair-bulbs.
Text Appearing After Image:
Fig. 8.—Transverse Section of a Cat's e. Cortical substance. GREATLY MAGNIFIED. m. Pith or medulla. Certain accessory structures are called sebaceous glands. These are minute flask-shaped bags (secreting an oily substance), which open into the upper part of the hair follicles, and so serve to lubricate the hair. New hairs are formed by the budding off of a new papilla and follicle from beside tho&3 first developed, and by the growth of a cluster of epidermic cells at the bottom of the new follicle. Neither the new nor the older follicles are really formed by an actual in- flection of the skin, though when completed they appear as if they had been so formed. Minute blood-vessels and nerves enter the roots of hairs, but do not extend beyond the dermal papilla. § 14. Such are the appendages and such is the nature ot the skin which clothes the cat's body externally, and which varies in thickness in different regions, being very thin on the lips, ears, and eyelids, thicker on the back and outer sides of the limbs than on the belly, and especially thick upon the pads of the feet on which the animal walks. Of these there are seven in the fore paw, and five in the

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