part of part of develops from develops from diencephalon optic cup optic stalk http://upload.wikimedia.org/wikipedia/commons/2/2f/Gray864.png UMLS:C0231107 EHDAA2:0001318 NCIT:C34235 optic stalks AAO:0011077 UBERON:0003098 (...) an essentially similar sequence of events occurs during the embryonic development of the vertebrate eye. The eye initially develops as a single median evagination of the diencephalon that soon bifurcates to form the paired optic vesicles. As each optic vesicle grows towards the body surface, its proximal part narrows as the optic stalk, and its distal part invaginates to form a two-layered optic cup.[well established][VHOG] The narrow, proximal portion of the optic vesicle which connects the embryonic eye and forebrain. XAO:0000475 pedunculus opticus EMAPA:16678 Wikipedia:Optic_stalk The evagination from the neural tube of the developing embryo which develops the optic cup at its extremity; the stalk persists as the optic nerve. [TFD][VHOG] ZFA:0000137 VHOG:0000223 TAO:0000137 SCTID:308788004 EHDAA:3816 ecto-epithelium developing neuroepithelium