HISTOLOGY AND CYTOCHEMISTRY OF HUMAN SKIN .14. THE BLOOD SUPPLY OF THE CUTANEOUS GLANDS

[摘要] The blood vessels supplying sebaceous and sweat glands were visualized by the azo-dye technique of Gomori for alkaline phosphatase and examined in skin specimens from 34 subjects, 9 months to 78 years old. The sebaceous glands are invested by a network of capillaries which generally spring from a single parent arteriole that comes from the hair follicle. With aging, the complexity of the blood supply increases in proportion to the degree of the lobulation and the size of the glands. There is no difference in the vascularity of the secretory and the duct portions of the coiled eccrine sweat gland. The straight eccrine sweat duct is accompanied by 2 or 3 interconnected vessels as it courses toward the epidermis. Where the duct reaches the epidermis, these vessels branch into the subpapillary plexus. Apocrine sweat glands are supplied by a rich plexus of capillaries that surround all portions of the tubules. The dilated segments of the tubules are as richly vascularized as the constricted ones. Some capillaries directly interconnect the plexus of the different cutaneous glands with each other and with those supplying hair follicles and the epidermis. These interconnections become particularly abundant in the skin of aged people.