Brain & Special Senses Lab: Eyes

List in sequence the structures, segments and fluids of the eye as light passes through to reach the fovea centralis.

1. Light 2. Clear cornea 3. Aqueous humor 4. Pupil 5. Lens 6. Vitrious humor 7. Retina 8. Fovea centralis

Eye Anatomy - shows clearer picture of fovea centralis & macula lutea

Fovea centralis is located in the depression of macula lutea

Fibrous Tunic

Outer layer of the eye primarily composed of connective tissue known as the sclera and cornea

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 thus insensitive to light.

Ciliary Body

Ring of tissue behind the peripheral iris that is composed of ciliary muscle and ciliary processes

Suspensory Ligaments

a fibrous membrane that holds the lens of the eye in place

Iris

a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening

Macula Lutea

a yellowish central area of the retina that is rich in cones and that mediates clear detailed vision

Fovea Centralis

area consisting of a small depression in the retina containing cones and where vision is most acute

posterior segment of eye

filled with vitreous humor

Aqueous Humor

fluid in the eye, found between the cornea and the lens

Anterior Chamber

fluid-filled space between the cornea and iris

Vitreous Humor

jellylike substance found behind the lens in the posterior cavity of the eye that maintains its shape

Vascular Tunic

middle layer of the eye Iris, ciliary body, choroid

Choroid

middle, vascular layer of the eye, between the retina and the sclera

Sensory Tunic

retina - Neural tunic of the eyeball; the innermost of the three tunics of the eye; contains photoreceptors (rods, cones) in the deepest layer, bipolar neurons, amacrine cells and horizontal cells in the middle layer, and ganglion cells in the superficial layer.

Posterior Chamber

space between the back of the iris and the front of the vitreous chamber; filled with aqueous humor

Pupil

the adjustable opening in the center of the eye through which light enters

Retina

the light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information

Optic Nerve

the nerve that carries neural impulses from the eye to the brain

Cornea

the transparent layer forming the front of the eye.

Lens

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

Sclera

white of the eye