. Productive sheep husbandry . Sheep. 52 STRUCTURE OF THE SHEEP very dark faces and iegs, the skin, if healthy, is bright pink or cherry in color, but in the exceptions noted and in sheep bearing dark wool it is often bluish and in some cases almost black. In nearly all breeds the naked skin around the muzzle is black. The skin ^ consists of the cutis or skin proper and its epidermal appendages, the hair, wool, hoofs, and horns. The cutis is com- posed of two layers, the epidermis, a superficial epithelial Fig. 23.—Diagrammatic section of skin, showing (a) shaft of hair arising from th
. Productive sheep husbandry . Sheep. 52 STRUCTURE OF THE SHEEP very dark faces and iegs, the skin, if healthy, is bright pink or cherry in color, but in the exceptions noted and in sheep bearing dark wool it is often bluish and in some cases almost black. In nearly all breeds the naked skin around the muzzle is black. The skin ^ consists of the cutis or skin proper and its epidermal appendages, the hair, wool, hoofs, and horns. The cutis is com- posed of two layers, the epidermis, a superficial epithelial Fig. 23.—Diagrammatic section of skin, showing (a) shaft of hair arising from the follicle, (6) sebaceous glands and (c) sweat glands. (From "Structure of the Wool Fi- bre," Bowman. Courtesy of The Macmillan Co.) and the derma or corium, a deep, connective-tissue layer, which is supplied with blood vessels and nerves and contains glands aiid hair-follicles. The hair-follicle is a modification of the skin and, according to Sisson, may be regarded as an invagination or a folding-inward of the epidermis. It seems, however, that the follicles of the larger human hairs contain both epidermal and dermal elements * (Fig. 23). The hair originates at the bottom or base of the hair-follicle from an extension of the corium called a papilla, to which the "See Sisson's "Veterinary Anatomy," 1911. * Bailey, "Text Book of Histology," Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coffey, Walter Castella, 1877-. Philadelphia : J. B. Lippincott
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsheep, bookyear1918
