Vet Tech A&P Chapter 10 (eye structure)

Cornea

transparent “window” on the rostral surface that admits light to the interior of the eye

Extraocular Muscles

attaches to the sclera of the eye inside the bony orbit. Holds the eyeball steady and produces delicate and accurate eye movements

Optic Nerve

Carries the visual impulses from the eye to the optic chiasm

limbus

area where the sclera and cornea meet

Sclera

white of the eye

Iris

colored portion of the eye

Pupil

opening or hole in the center of the iris through which light passes

Ciliary body

ring shaped structure that controls the shape of the lens. Located just behind the iris but still in the rostral part of the eye

suspensory ligaments

dark material surrounding the lens

Choroid

middle, vascular layer of the eye, between the retina and the sclera. contains dark pigment and blood vessels that supply the retina

retina

the light sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that being the processing of visual information. lies against the choroid, lining the back of the eye

Tapetum

A reflective layer of the choroid in the eyes of many animals, causing them to shine in the dark

Optic disc

region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is sensitive to light

lens

the transparent structure behind the pupil that changes shapes to help focus images on the retina

Vitreous Humor

jelly like substance found behind the lens in the posterior cavity of the eye that helps maintain its shape

aqueous humor

the clear fluid filling the space in the front of the eyeball between the lens and the cornea