. The anatomy of the domestic animals. Veterinary anatomy. 880 THE SENSE ORGANS AND SKIN OF THE HORSE THE APPENDAGES OF THE SKIN The appendages uf the skin are nuidificatiuns of tlie epidermis, and comprise the hairs, hoofs, claws, horns, etc. The hairs (Pili) cover almost the entire surface of the Ixidy in tlie domesticated mammals, and some parts which ap])ear at first sight to be Iiare are found on close inspection to be provided with sparse and very fine hair. The hairs are constantly being shed and replaced, Init at certain periods in the horse, for example, they fall out in great numbers
. The anatomy of the domestic animals. Veterinary anatomy. 880 THE SENSE ORGANS AND SKIN OF THE HORSE THE APPENDAGES OF THE SKIN The appendages uf the skin are nuidificatiuns of tlie epidermis, and comprise the hairs, hoofs, claws, horns, etc. The hairs (Pili) cover almost the entire surface of the Ixidy in tlie domesticated mammals, and some parts which ap])ear at first sight to be Iiare are found on close inspection to be provided with sparse and very fine hair. The hairs are constantly being shed and replaced, Init at certain periods in the horse, for example, they fall out in great numbers, constituting the shedding of the coat. It is customary to distinguish the ordinary hairs (the coat), which determine tlie color of the animal, from the special varieties found in certain places. Among the latter are the long. Fici. 70!!.—Lateral Vti TO Show Ha AND (.\ftor l''.llciih('rger-Bauin. Aimt. fur tactile hairs aliout tlie lips, nostrils, and eyes; llie eyelashes or cilia; the tragi of tlu' external ear; and tlie vibrissse of the ^triis. Other s])erial features will be noted in the discussion of the skin of the various s]XH-ies. The iiairs are directed in such a way as to form more or less definite hair-streams (Flumina pilorum), and at certain points these converge to form vortices (Vortices pilonun). The pait of the hair above the surface of the skin is the shaft (Scapus pili), while tlie root (Radix pili) is embtMlded in a depression termed the hair-follicle (Folliculus pili). A vascular papilla (Paiiilla pili) projects up in the fundus of 1he follicle and is capped by the expandetl entl of the root, the bulb of the hair (Bulbus pili). The hair-follicles extend obliquely into the corium to a varying depth; in the case of the long tactile hairs they reach to the underlying muscle. Must of the follicles have attached to them small unstriped muscles knowni as the arrectores pilorum; these are attachetl at an acute angle to the under side of the
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
