part of optic nerve development anatomical structure development optic chiasma development biological_process The developmental process pertaining to the progression of the optic chiasm from its initial formation to the mature structure. The process begins when the pathfinding of the axons of the developing optic nerve cause some axons to cross at the midline of the brain and ends when the axons are mature. GO:0061360 dph 2010-10-13T08:00:29Z optic chiasm development