part of part of develops from develops from diencephalon optic cup optic stalk The narrow, proximal portion of the optic vesicle which connects the embryonic eye and forebrain. XAO:0000475 EHDAA2:0001318 EMAPA:16678 Wikipedia:Optic_stalk ZFA:0000137 NCIT:C34235 AAO:0011077 TAO:0000137 VHOG:0000223 EHDAA:3816 SCTID:308788004 UBERON:0003098 ecto-epithelium developing neuroepithelium