Amsterdam : Elsevier Science ; — As already mentioned, both the supporting and the steroidogenic cell lineages derive from WT1-positive somatic progenitors present in the undifferentiated gonadal ridges. Sex reversalwhere the development of a sexual phenotype is redirected during embryonic development, happens in the initiation phase of gonadal sex differentiation.
In adult Leydig cells, the capacity to respond to sustained gonadotropic stimulation by increased androgen production is curtailed by the development of a refractory state, due to receptor down-regulation
Trends Genet. In males, the gonads are the testes and in females they are the ovaries. For example, changes in sexual receptivity, food intake, and locomotor activity occur primarily during the dark period when rodents ovulate Thelarche Development Lactation Breastfeeding.
And finally, it may be a calcified shell, as in birds and reptiles. You are commenting using your WordPress. The internal genitalia consist of two accessory ducts: mesonephric ducts male and paramesonephric ducts female.
NY: Psychology Press.
This is supported by the finding of adrenal markers and adrenal-like cells in the fetal testis , and of adrenal rests in the testes of male patients with congenital adrenal hyperplasia Steroid sex hormones in the rat brain: specificity of uptake and physiological effects. In XX gonads, very few endothelial cells migrate from the mesonephros to the gonad, which suggests that cortical and medullary domains of the ovary are already established in early gonadogenesis, although no morphological boundaries are evident, consistently with molecular evidence of discrete gene expression domains specified by