. A practical treatise on diseases of the skin, for the use of students and practitioners . hree veinlets, one of which LYMPHATICS. 25 always accompanies the duct of the gland upward as far as thepapillary layer, where it anastomoses with the vessels of that[•art of the skin. The ascending arterioles supply also the seba-ceous glands and hair-follicles; and finally, breaking up intosmaller and yet smaller branches, furnish a single or doublecapillary loop to each papilla. The capillaries of the papillarylayer anastomose freely with those transversely arranged in theupper portion of the hair-fo
. A practical treatise on diseases of the skin, for the use of students and practitioners . hree veinlets, one of which LYMPHATICS. 25 always accompanies the duct of the gland upward as far as thepapillary layer, where it anastomoses with the vessels of that[•art of the skin. The ascending arterioles supply also the seba-ceous glands and hair-follicles; and finally, breaking up intosmaller and yet smaller branches, furnish a single or doublecapillary loop to each papilla. The capillaries of the papillarylayer anastomose freely with those transversely arranged in theupper portion of the hair-follicle, loops from which also pass tothe sebaceous glands. The hair-papilla has a vascular supplysimilar to that of the other papillae of the corium. Vaso-motor nerves are twined around these vessels in alltheir ramifications. The whole vascular system, as thus ar-ranged, plays a most important part in all the healthy andmorbid processes which occur in the skin, as well as in the sud-den physiological changes distinguishable to the eye in thephenomena of blanching and blushing. Fig. 4. Pacinian body, after silver stainingshowing superimposed endothelial lay-ers (After Renaut.) Section of Pacinian body, from a ducks bill. ,lamellar envelope ; , hyaline zoue of the lamel-lar envelope; bt, terminal bulb of the nerve; ,, layer investing the cavity of the body. (AfterRenaut.) Lymphatics. The skin is supplied with a perfectly closed system of lymph-vessels. These are distributed to the subcutaneous tissues, wherethey form a deep layer; a superficial plexus lying also immedi-ately beneath the superior pars vascularis of the corium. Fromthe latter loops are presumably given off to the papillae, as well 26 ANATOMY AND PHYSIOLOGY OF THE SKIN. us ti) the pilary, sudoriparous, and sebaceous follicles. In tliemucous layer of the epidermis, Heitzmann has also described deli-cate <\-c;iv;iticiis in the cement-substance between the epithelia,which Berve as lymph-conduits. Th
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