FORMATION OF OPTIC VESICLE  AND OPTIC STALK  

The area of neural plate (Fig. 1.5A) which forms the prosencepholon develops a linear thickened area on
either side (Fig. 1.5B), which soon becomes depressed to form the optic sulcus (Fig. 1.5C). Meanwhile the
neural plate gets converted into prosencephalic vesicle. As the optic sulcus deepens, the walls of the
prosencepholon overlying the sulcus bulge out to form the optic vesicle (Figs. 1.5D, E&F). The proximal
part of the optic vesicle becomes constricted and elongated to form the optic stalk (Figs. 1.5G&H).