Prenatal development of the adrenal gland in the one-humped camel (Camelus dromedarius).

摘要: Summary Each adrenal gland consisted of cortex and medulla that developed from different embryological origins presented cellular organization. One hundred male or female camel embryos fetuses with crown vertebral rump lengths (CVRL) ranged 0.8 to 117 cm were examined. The cortex, which is derived intermediate mesoderm, was first observed in the 0.8-cm CVRL embryo. initially combined gonad as a thickened region proliferating cells splanchnic mesoderm. Adrenocortical tissue separated gonadal 2-cm fetus separate dorso-medial mass cells. At 2.5-cm CVRL, adrenocortical surrounded by capsule undifferentiated mesenchymal cells, except at its proximal pole, where an invagination located through chromaffinoblast entered cortex. migrated neural crest form developing gland. In 3.5-cm fetus, differentiated into two layers: inner fetal outer definitive As development proceeded, degenerated formed zona glomerulosa fasciculata. reticularis did not until end gestation. During prenatal life, much thicker than