8 week embryonic eye (cross section)

3D Model

The eyes appear early in the fourth week in the form of a pair of lateral grooves , the optic sulci , which evaginate from the forebrain neural groove to form the optic vesicles . References :- 1- Larsen’s Human Embryology textbook ( Sixth Edition ). 2- the anatomy of human embryo electron microscope textbook ( 1st Edition ) . 3-langman medical embryology textbook ( Fourteenth Edition ).