RADIATION EFFECTS IN SWINE: I. VASCULAR SUPPLY OF THE SKIN AND HAIR
Abstract
The characteristic hair coat of the domestic swine used in these studies consisted of rather coarse evenly grouped follicles. The density of hair coat decreased rapidly with increasing age and surface area, so that the number of hairs per square centimeter on a Yorkshire animal dropped from 150 to 31 while the weight increased from 10 to 50 kilograms. The more sparsely-haired Hanford-Labco animals had only 8-10 hairs per sq cm at maturity. Growing hairs had a rich vascular supply to the dermal papillae and around the bases of the hair follicle. During a spontaneous or X-ray-induced transition from anagen to catagen stages of the hair grown cycle, the vessels remained functional. In contrast, the large 'apocrine' sweat glands had very few associated capillaries, possibly reflecting their very limited secretory activity. Sections of biopsy material taken from animals injected intravenously with small particles of colloidal carbon tended to confirm the impression that the size, orientation, and distribution of vessels in the skin of the swine and human are remarkably similar.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 14, 1967
- Accession Number
- AD0664213
Entities
People
- P. D. Forbes
Organizations
- Naval Radiological Defense Laboratory