The cornea and eye structure

What part of the eye is densely supplied with sensory free nerve endings?

The cornea

The free nerve endings in the cornea do what?

trigger the blinking reflex

The cornea's surface is?

covered with a tear film produced by glands in the eyelid

Layers of the Cornea: The anterior surface

non-keratinized stratifiedsquamous epithelium

Layers of the Cornea:Bowman's membrane

This is part of the anterior portion of the eye

-Right under the anterior surface

- non-cellular

Layers of the Cornea:The stroma

-comprises approximately 90% of the cornea's thickness

-Consists of type I collagen fibers and fibroblasts

Layers of the Cornea: The posterior surface

-Comprised of simple squamous epithelium called endothelium

The posterior surface: Endothelium

Has a basal lamina called Descemet's membrane.

The posterior surface: The endothelium cells

This tissue contains a Na/K pump responsible for maintaining its proper state of hydration.

What do the circular muscles of the iris do?

They constrict the pupil

What do the radial muscles do?

They dialate the pupil

The layers of the lens:anterior layer

Made of simple cuboidal

The layers of the lens: posterior layer

composed of a protein called alpha-crystallin

The protien in the posterior layer has the ability to?

"prevent the precipitation of denaturedproteins and to increase cellular tolerance to stress.

Where does the lens focus light in the eye?

On the macula Lutea

What part of the eye has the greatest visual acuity?

The fovea centralis

-Tightly compact with cones

The area where the blood vesses enter and exit eye is called?

The Optic Disc> The blindspot