optic chiasma

American  

Or optic chiasm

noun

1. a site at the base of the forebrain where the inner half of the fibers of the left and right optic nerves cross to the opposite side of the brain.

---

Etymology

Origin of optic chiasma

First recorded in 1870–75

Example Sentences

Pressure on the optic chiasma, for example by a tumour of the pituitary body, is associated with bilateral temporal hemianopsia.

From Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. by Miles, Alexander