What shape is formed by the crossing of the optic nerves?

The crossing of the optic nerves forms an "X" shape, which is known as the optic chiasm. This structure is located at the base of the brain and is critical for visual processing. In the optic chiasm, fibers from the nasal (inner) half of each retina cross over to the opposite side of the brain, while the temporal (outer) half of each retina remains on the same side. This arrangement allows visual information from both eyes to be processed together by the visual cortex, contributing to depth perception and a more comprehensive visual field. The shape of the crossing resembles an "X", which is vital for understanding how visual signals are integrated from both eyes. This physical structure and its arrangement are fundamental in understanding certain visual phenomena and disorders.