Zebrafish optic chiasm

Light microscope image of a normal two-day-old zebrafish embryo which has been stained to show all of the nerve cell processes in the eyes and brain. The embryo is transparent, so the long, thin processes (axons) can be seen as they leave the eye and cross the midline of the brain as a tight bundle, or commissure toward their target brain regions. (credit: R. MacDonald & S. Wilson)