Terminology Service for NFDI4Health
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optic disc

Go to external page http://purl.obolibrary.org/obo/UBERON_0001783

The optic disc or optic nerve head is the location where ganglion cell axons exit the eye to form the optic nerve. There are no light sensitive rods or cones to respond to a light stimulus at this point. This causes a break in the visual field called 'the blind spot' or the 'physiological blind spot'. The optic nerve head in a normal human eye carries from 1 to 1.2 million neurons from the eye towards the brain. [WP,unvetted]. [ http://en.wikipedia.org/wiki/Optic_disc ]

Term info

Label

optic disc

Synonyms
  • optic disk
database cross reference
Subsets

uberon_slim, efo_slim, pheno_slim

depicted by

http://upload.wikimedia.org/wikipedia/commons/e/ed/Gray879.png

external definition

The small blind spot on the surface of the retina. It is the point where the fibers of the retina leave the eye and become part of the optic nerve. [TFD][VHOG]

has related synonym

optic disk, optic papilla, physiologic blind spot, physiologic blind spot of mariotte, optic nerve disc, optic nerve head

homology notes

(...) we reach the inescapable conclusion that the last common ancestor of jawless and jawed vertebrates already possessed an eye that was comparable to that of extant lampreys and gnathostomes. Accordingly, a vertebrate camera-like eye must have been present by the time that lampreys and gnathostomes diverged, around 500 Mya (reference 1); Although the eye varies greatly in adaptative details among vertebrates, its basic structure is the same in all. The human eye is representative of the design typical for a tetrapod (reference 2).[well established][VHOG]

id

UBERON:0001783