The prochordal plate marks the site of the future
The prochordal plate is a circular, midline thickening of hypoblast cells that are firmly attached to the overlying epiblast cells. The plate will eventually develop into a membrane called the Buccopharyngeal membrane at the site of the future mouth.
Umbilical cord
Hea
Mouth
Anus
Development period- week 1,2,3,4