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상품 게시판 상세
제목 혈액공급과 림프계 , 신경 (Bonnie D. Hodge; Robert T. Brodell.)
작성자 윤미경연구소 (ip:)
  • 평점 0점  
  • 작성일 2018-09-25
  • 추천 추천하기
  • 조회수 50

Blood Supply and Lymphatics

Sweat glands along with all other skin appendages receive blood supply from cutaneous perforators of underlying source vessels. The perforators may branch directly from the source as septocutaneous or fasciocutaneous perforators or from muscular branches as musculocutaneous perforators. Once these perforators reach the skin, they form extensive networks called dermal and subdermal plexuses. Interconnections between these plexuses form via connecting vessels that run perpendicular to the skin surface, forming a continuous vascular plexus in the skin.

Lymphatic drainage parallels the blood supply, starting with blind-ended lymphatic capillaries in the dermal papillae. These drain into dermal and deep dermal plexuses that eventually coalesce to form larger lymphatic vessels.



Nerves

Eccrine sweat glands receive sympathetic innervation via cholinergic fibers that send impulses in response to changes in core body temperature. Sympathetic innervation to the sweat glands is mediated by the thermoregulatory center of the hypothalamus. A short preganglionic cholinergic fiber is originating from the thoracolumbar region of the spinal cord synapses with the postganglionic neuron via nicotinic acetylcholine. The postganglionic fiber releases acetylcholine, which differs from all other sympathetic postganglionic fibers that release norepinephrine. Cholinergic stimulation of muscarinic receptors induces sweating. Apocrine sweat glands receive adrenergic sympathetic innervation. Because apocrine sweat glands respond to norepinephrine, they are involved in emotional sweating due to stress, fear, pain, and sexual stimulation.



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