The crossing of the optic nerves on the ventral surface of the brain.
A structure where some of the optic nerves from each eye partially cross each other in the hypothalamus.
This is formed by a crossing-over of the two optic nerves which run from the back of the eyeballs to meet in the mid line beneath the brain. Nerve fibres from the nasal part of the retina cross to link up with fibres from the outer part of the retina of the opposite eye. The linked nerves form two separate optic tracts which travel back to the occipital lobes of the brain.
An X-shaped crossing of the optic nerve fibers in the brain. Past this point, the fibers travel in optic tracts. Fibers that originate in the outer half of the retina end on the same side of the brain; those from the inner half cross over to the opposite, or contralateral, side.
The point where the nerves connect to the eyes, specifically the optic nerves, is called the optic chiasm. At this juncture, nerve fibers from the inner portion of each retina cross over and merge with the optic nerve on the opposite side. Consequently, when there is a neurological condition affecting one half of the brain, it can lead to partial blindness, impacting not only the eye on the same side but also the one on the opposite side of the visual field.