Eye structures and functions

Cornea

transparent window, primary lens

sclera

tough layer, gives the eye shape

external exrtinsic mucles

controls eye movements

optic nerve

carry visual signals from the retina at the back of the eye to the brain

• cord like structure

vitrous humor

jelly like glob, which gives the eye shape and holds the retina in place

retina

tissue like structure that captures incoming light from the lens, convert it into electrical signlas, and send those signals to the brain so you can see images

Choroid layer

dark black layer, which supplies oxygen and vital nourishment to the outer layers of the retina

iris

smooth ring that controls the size of the pupil and regulates the amount of light that enters the eye, gives the eye its color

cilliary body

striated ring that contains the ciliary muscles

• focuses the lens, holds the lens in place and produces eye fluid

pupil

hole where the lens sits, regulates the amount of light entering the eye

optic disc

suspensory ligaments

tapetum lucidum

superior rectus

inferior rectus

medial rectus

lateral rectus

superior oblique

inferior oblique

extrinsic eye muscles