chiasmal

9.9

Relating to the point where the two optic nerves cross behind the eyes

adjective
/kaɪˈæzməl/

Specialized

: quiasmático

The patient exhibited visual field deficits due to a chiasmal lesion.

Examples

Tumors in the chiasmal region can affect both eyes.
Doctors monitored the growth of the chiasmal mass with regular scans.
The chiasmal structure is crucial for visual processing.
In the chiasmal region, nerve fibers cross over.
The patient exhibited visual field deficits due to a chiasmal lesion.
Tumors in the chiasmal region can affect both eyes.
Doctors monitored the growth of the chiasmal mass with regular scans.

Synonyms

chiasmic

vschiasmal

1 9.9

Having a shape like the letter X or describing where two parts cross

is limited to the anatomical eye nerve crossing rather than broad uses

chiasmatic

vschiasmal

Specialized

9.9

Relating to the crossing of nerve fibers, especially where the optic nerves cross

is used mainly for the optic crossing rather than any neural crossing

Surface Forms

chiasmal positive

Morphology

chiasmal = chiasm (semi-transparent) = chiasm + al

The adjective is formed regularly from the noun 'chiasm' with '-al', but the sense is specialized anatomical terminology rather than an everyday meaning.

Etymology

Chiasmal comes from the Greek chiasma, and from chi (the letter X), which gives the idea of 'crossing'. It is used for places where nerves cross, especially the optic chiasm where the two optic nerves meet, so chiasmal means 'relating to a crossing' in the body.