Diseases of the horse's foot Diseases of the horse's foot diseasesofhorses00reek Year: 1918 GENERAL OBSERVATIONS 49 The Sudoriferous or Sweat Glands are composed of coiled tubes which lie in the deeper portion of the skin, and send up a corkscrew-like duct or open on the surface of the epidermis. They are numerous over the whole of the body. The Human Nails are thickenings of the lowermost layer of the horny portion of the epidermis, the stratum lucidum. They are developed over a modified portion of the corium known as the nail-bed. The horny substance of the nail is composed of clear horny
Diseases of the horse's foot Diseases of the horse's foot diseasesofhorses00reek Year: 1918 GENERAL OBSERVATIONS 49 The Sudoriferous or Sweat Glands are composed of coiled tubes which lie in the deeper portion of the skin, and send up a corkscrew-like duct or open on the surface of the epidermis. They are numerous over the whole of the body. The Human Nails are thickenings of the lowermost layer of the horny portion of the epidermis, the stratum lucidum. They are developed over a modified portion of the corium known as the nail-bed. The horny substance of the nail is composed of clear horny cells, and rests im- Fig. 25.—Longitudinal Section through Nail and Nail-bed of a Human Foetal Finger.* a, The nail; b, the rete mucosum; c, the longitudinal ridges of the corium. mediately upon a Malpighian layer similar to that found in the epidermis generally. Instead of the papilla? present else- where in the skin, the corium of the nail-bed is marked by longitudinal ridges, a similar, though less distinct, arrangement to that found in the laminae of the horse's foot. * Seeing that the section is a longitudinal one, it would appear from the way the ridges cut that they are running transversely beneath the nail. Their extreme delicacy, however, prevents a single one showing itself along the length of the section, and their constant accidental cutting makes them appear to run transversely (H. C. R.).
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