Definition of Retna

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Definition of Retna

Retina, a retiform expansion of the sensatory nerves, which receives the impression that gives rise to vision, or visual perception.

- Wikipedia

Ret"i*na (?), n. [NL., from L. rete a net. Cf. Reticule.] (Anat.) The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See Eye.

&fist; The fibers of the optic nerve and the retinal blood vessels spread out upon the front surface of the retina, while the sensory layer (called Jacob's membrane), containing the rods and cones, is on the back side, next the choroid coat.

Ret"i*na (?), n. [NL., from L. rete a net. Cf. Reticule.] (Anat.) The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See Eye.

&fist; The fibers of the optic nerve and the retinal blood vessels spread out upon the front surface of the retina, while the sensory layer (called Jacob's membrane), containing the rods and cones, is on the back side, next the choroid coat.

- Webster's Unabridged Dictionary (1913)

(anatomy) The thin layer of cells at the back of the eyeball where light is converted into neural signals sent to the brain.

- The Nuttall Encyclopedia

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