genital ridge

The genital ridge from which either the ovary or testis is formed.

Mesonephric tubules are genital ridges that are next to the mesonephros.

The ovary is thus formed mainly from the genital ridge and partly from the mesonephros.

Early in fetal life, germ cells migrate from structures known as yolk sacs to the genital ridge.

In embryology, the gonadal ridge (or genital ridge) is the precursor to the gonads.

These germ cells then travel, via amoeboid movement, to the genital ridge and eventually into the undifferentiated gonads of the fetus.

In the mouse gonadal primordium, the genital ridge, which forms from intermediate mesoderm, becomes morphologically distinct at E10.5.

The migration of these PGCs is similar to amphibians along the dorsal mesentery to the genital ridges.

By birth, the dorsal aorta becomes the descending aorta, while the genital ridges form the gonads.

The gonads begin as bulges of tissue called the genital ridges at the back of the abdominal cavity, near the midline.

Jesle, Y. et al. "Expression of a linear Sry transcript in the mouse genital ridge."

By the fifth week, the genital ridges differentiate into an outer cortex and an inner medulla, and are called indifferent gonads.

The testes begin as an immigration of primordial germ cells into testicular cords along the genital ridge in the abdomen of the early embryo.

Before E10.5, Dmrt1 is expressed at similar levels in the genital ridges of XX as well as XY embryos.

Thereafter, complex factors that are not well understood direct their proliferation, survival, migration to the genital ridge, differentiation into oocytes, and the subsequent expenditure of oocytes via ovulation or apoptotic death.

During organogenesis (around the fourth week in human embryos), the visceral region of the mesoderm, the splanchnopleura, transforms into distinct structures consisting of the dorsal aorta, genital ridges and mesonephros.

The presence of Sry in the genital ridge results in testis formation by directing the differentiation of Sertoli cells in a bipotential genital ridge.

It contains the dorsal aorta, genital ridges and mesonephros and lies between the notochord and the somatic mesoderm, extending from the umbilicus to the anterior limb bud of the embryo.

At first the mesonephros and genital ridge are suspended by a common mesentery, but as the embryo grows the genital ridge gradually becomes pinched off from the mesonephros, with which it is at first continuous, though it still remains connected to the remnant of this body by a fold of peritoneum.