Gametogenesis and fertilisation
- Animated embryology
- Gametogenesis and Fertilisation
- Cleavage and cell differentation
- Organogenesis. Germ layer derivatives.
- Fetal membranes and placentation
- Development of the blood cells, vessels and heart
- Development of the blood circulation
- Pharynx and branchial arches
- Respiratory systen and body cavities
- Digestive system
- Urinary system
- Genital system
- Musculo skeletal system
- Nervous system and special senses
External genitalia
Indifferent stage
Female
In horses, the identification of fetal sex by location of the genital tubercle between 55 and 70 days of pregnancy is hampered by the large amount of allantoic fluid, extensive fetal movements and the extremely long umbilical cord; however, reliable results have been achieved by ultrasonographic evaluation of the fetal gonads at 110–150 days of pregnancy.
In human, the ultrasound gender scan is probably the most common way that parents discover the sex of their baby. As far as we know, we have a 100% accuracy gender prediction rate over 16 weeks.
Male
