File:The Horse - its treatment in health and disease, with a complete guide to breeding, training and management (1905) (14591852778).jpg

Identifier: horseitstreatmen09axej (find matches)
Title: The Horse : its treatment in health and disease, with a complete guide to breeding, training and management
Year: 1905 (1900s)
Authors: Axe, J. Wortley
Subjects: Horses
Publisher: London : Gresham
Contributing Library: Webster Family Library of Veterinary Medicine
Digitizing Sponsor: Tufts University

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Text Appearing Before Image:
eseparts are indicated in the figures referred to, which may be taken torepresent the minute structure of the organs exhibited in fig. 665, a, b, c, d. Sections of the ergot in the horse and in the ass exhibit exactly thesame intimate structure. In fact they differ only in the size and formof the horny growth. No further proof can be required in support ofthe statement that chestnuts and ergots, whether they appear as hornyexcrescences or as bare patches of hardened cuticle, are in their minute SKIN INIARKINGS AND CALLOSITIES OF THE HORSE 507 structure identical with hoof horn, and further, that the membrane fromwhich they are developed is a vascular villous membrane, precisely analo-gous to the villous meml>rane of the coronary surface and sole of thehorses foot, which has already been described and figured on pp. 434 and435 of this volume. These facts would have consisted remarkably well with the theory oftheir being remnants of digits, were it not for the cogent objections which
Text Appearing After Image:
Fig. 666.—Sections of Chestnut and Ergot of Horse and Bare Patch of Ass A, Horizontal section through chestnut of horse — 1, horn; 2, villous secreting membrane; 3, subcutaneoustissue; 4, muscle. B, Perpendicular section through ergot of horse — 1, horn; 2, villous secreting membrane;3, subcutaneous tissue. c, Section through bald patch of ass: a, the bare patch; b, skin—1, horny layer ofepidermis; 2, malpighian (mucous) layer of epidermis ; 3, derma; 4, subcutaneous tissue. have been urged against that view. As it is, the identity of structure inthe horny growths and the horn of the foot does not tend to assist in theattempt to assign to them any special economy, or in any way to indicatewhat functions they might have po.ssessed in their more developedcondition. Plantar pads are represented in fig. 664, A, B (p. 503) in man anddog, and their corresponding positions in the leg and foot of the horse areindicated at c in the same figure. It has been stated already that these 508

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