Fertilization
Fertilization takes place when the spermatozoon has successfully entered the ovum and the … See more

Following gastrulation, the ectoderm gives rise to epithelial and neural tissue, and the gastrula is now referred to as the neurula. The neural plate that has formed as a thickened plate … See more

Face and neck
From the third to the eighth week the face and neck develop.
Ears
The See more

• Embryo loss
• Aorta-gonad-mesonephros
• CDX2
• Developmental biology See more

The primitive streak, a linear collection of cells formed by the migrating epiblast, appears, and this marks the beginning of gastrulation, which takes place around the seventeenth day … See more

Organogenesis is the development of the organs that begins during the third to eighth week, and continues until birth. Sometimes full … See more

Toxic exposures in the embryonic period can be the cause of major congenital malformations, since the precursors of the major organ systems are now developing.
Each cell of the … See more