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肾上腺是体内最大的内分泌腺,其实质分为皮质和髓质两部分。皮质分为3个带,分泌多种甾类激素,来源于中胚层。髓质起源干神经嵴,由许多聚集成团索状的嗜铬细胞组成,受交感节前纤维支配。髓质有丰富的血窦,并常见交感神经神经节细胞。嗜铬细胞分泌去甲肾上腺素(noradrenaline,NA)、肾上腺素(adrenaline,A)、5-羟色胺等多种胺类物质,近年发现还分泌几种肽,并由于起源于神经外胚层,故属神经内分泌细胞。因其能产生
The adrenal gland is the largest endocrine gland in the body, its essence is divided into two parts of the cortex and medulla. Cortex is divided into three zones, the secretion of a variety of steroid hormones, derived from the mesoderm. The medullary origin of the dry neural crest, by many gathered into a cord-like chromaffin cells, dominated by the sympathetic preganglionic fibers. Medulla is rich in sinusoids, and common sympathetic ganglion cells. Chromaffin cells secrete norepinephrine (noradrenaline, adrenaline, 5-hydroxytryptamine and other amines, in recent years also found that several peptides were secreted, and originated in the neuroectoderm, it is Neuroendocrine cells. Because it can produce