optic chiasma

or optic chiasm

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.

Word History and Origins

Origin of optic chiasma¹

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 Project Gutenberg

The optic chiasma, where present, is involved in the floor of the thalamencephalon and forms a large, upwardly-projecting ridge.

From Project Gutenberg