人胎儿肾上腺的组织发生

用光镜、透射电镜观察了４例胚、９０例胎，４例新生儿肾上腺。结果表明，７周胚已可分辨胎儿皮质和永久皮质，１５周时永久皮质开始分化，出生时初级球状带和束状带已形成，网状带未出现；７周时神经嵴细胞开始迁入肾上腺，１３周时髓质形成，嗜铬细胞出现，１６周时交感神经节细胞出现，出生时仍有少量神经嵴细胞向肾上腺内迁移。

HISTOGENESIS OF HUMAN ADRENAL GLAND

Adrenal glands of 4 human embryos,90 fetuses and 4 neonates were observed with light microscope and transmissional electron microscope.The results showed that the fetal cortex and the permanent cortex were recognized in 7 week old embryo and began to differentiate in the 15th week of development.The primitive zona glomerulosa and zona fasciculata formed in the adrenal gland of neonates,while the zona reticularis were not recognizable at this time.The neural crest cells began to migrate into the adrenal gland at the 7th week of development.The medulla appeared at week 13,and the masses of the chromaffin cells were observed.The sympathetic ganglia cells presented at the 16th week.A few of neural crest cells migrated to the adrenal gland were obversed at neonates.