Here's a breakdown:
* Third Week: The neural tube forms, which will eventually develop into the brain and spinal cord. The heart begins to beat.
* Fourth Week: Limb buds appear, and the face starts to develop.
* Fifth to Eighth Weeks: Most major organs, including the brain, heart, lungs, liver, kidneys, and digestive system, continue to form and differentiate.
It's important to note that organogenesis is a complex and continuous process. While the majority of organs form within these weeks, further development and maturation continue throughout fetal development and even after birth.
