-
Conceived
-
(2 weeks, 2 days):
Primordial germ cells -
(3 weeks, 3 days)
Primordial germ cells begin moving from umbilical vesicle to hindgut -
(4 weeks)
Gonadal ridge extends from C-7 to T-8 levels
Primordial germ cells migrate to mesonephric ridges
Primordial germ cells number several hundred
Urogenital sinus -
Period: to
(4 weeks, 3 days - 5 weeks)
4 weeks, 3 days - 5 weeks):Germ cells migrate to gonads -
(4 weeks, 5 days)
Gonad framework found in coelomic epithelium
Primary urogenital sinus -
(5 weeks, 2 days)
Gonad region separates from mesonephros
Gonadal primordium
Labioscrotal swelling
Urogenital fold and groove
Urorectal septum -
(5 weeks, 6 days)
Genital eminence forms phallus or genital tubercle
Gonad grows into oval shape with irregular surface -
(6 weeks, 2 days)
Angiogenesis begins inside gonads
Gonad grows into oval shape with irregular surface
Ostium (abdominal) of uterine tube at rostral end of paramesonephric duct (in female embryos)
Paramesonephric duct forms from rostral end of mesonephric duct
Testicular cords in gonads of male embryos
Testicular cords in male gonad -
(6 weeks, 5 days)
-
(7 weeks, 1 day)
Ovaries full of primitive oogonia, intermediate pregranulosa cells, and mesenchyme
Testes with short straight tubules -
(8 weeks)
Ductus deferens
Interstitial cells forming within testis
Testicular tubules
Male embryos are making testosterone already!
Urethra -
(9 weeks)
Female fetuses have early reproductive cells in their ovaries -
(11 weeks)
Now you can tell if your baby is a girl or a boy! -
(19 weeks)
Number of oogonia peak (at about 7million) within fetal ovaries -
BAM!!! Baby Boy or Girl Is born!!!! :D
