. The sense of touch in mammals and birds : with special reference to the papillary ridges . and their ductspass through the corium in a straight line, becoming spiral intheir passage through the epidermis, open on the free orifices are seen on the surfaces of the ridges of the palmarand plantar surfaces, being absent from the furrows betweenthe ridges. The under-surface of the epidermis, which presentsthis row of projecting openings of sudoriparous ducts, is calledDriisenleisten by Schlaginhaufen and Miss Whipple. A diagram of a section of the human skin is here given (Fig. 52a)
. The sense of touch in mammals and birds : with special reference to the papillary ridges . and their ductspass through the corium in a straight line, becoming spiral intheir passage through the epidermis, open on the free orifices are seen on the surfaces of the ridges of the palmarand plantar surfaces, being absent from the furrows betweenthe ridges. The under-surface of the epidermis, which presentsthis row of projecting openings of sudoriparous ducts, is calledDriisenleisten by Schlaginhaufen and Miss Whipple. A diagram of a section of the human skin is here given (Fig. 52a) MINUTE ANATOMY OF PAPILLARY RIDGES 77 with the view of showing the main structures of the coveringof the hand and foot, and it may be taken as a type of the variousmodifications of the skin in lower mammaUan forms, the essentialfeatures being preserved in most of these. Indeed this is wellborne out by the diagram (Fig. 52b) * of a section of the skin ofthe hand of Macacus cynomologus, which is also given by wayof comparison. The more minute anatomy of the skin is not referred to, as it. Fig. 52a.—Section of Human Skin op Palmar Surface. Drawing copiedfrom Quains Anatomy, vol. i. pt. 2, p. 413. a, stratum corneum; h, stratum malpighii; c, corium; d, crest of papillaryridge; e, furrow of papillary ridge; /, opening of sudoriparous duct;/I, sudoriparous duct; k, stratum lucidum, is the object of this work to show only the variations in differentanimal forms of the outlines of the papillae of the corium and thepapillary ridges of the epidermis. It is very Hkely that furtherinvestigations will be made into the nerve-supply of the papillaeof the lower animals, and that these structures in the case of manwill be further worked out than they have been. But for thepresent purpose, it is not necessary to employ methods of stainingfor bringing out the variations of nerve-endings and nerve-fibrilsin different animals and different parts of their palmar and * Schlaginhaufen, Gegenbauers
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