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Chapter 9-3 "Sense of Vision"
Basic Key Terms
22
Anatomy
11th Grade
02/16/2010

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Cards

Term

 

aqueous

humor

Definition

A watery fluid that fills the anterior chamber of the eye.

Term

 

blind spot

Definition

 

The area where the optic nerve passes through the retina & where vision is not possible due to the absence of rods and cones.

Term

 

choroid

Definition

 

The vascular, pigmented middle layer

of the wall of the eye.

Term

 

ciliary

body

Definition

 

Structure associated with the choroid layer of the eye that secretes aqueous humor and contains the ciliary muscle.

Term

 

ciliary muscle

Definition

 

The structure that controls the curvature of

the lens of the eye.

Term

 

cone cell

Definition

Color receptor located

in the retina of the eye.

Term

 

conjunctiva

Definition

 

 

A transparent mucous membrane

which lines the inner surface of an eyelid.

Term

 

 

cornea

Definition

Transparent, anterior portion of the outer layer of the eyeball.

Term

 

fovea centralis

Definition

 

The region of the retina that consists

of densely packed cones and

is responsible for the greatest visual acuity.

Term

iris

Definition

Muscular ring the surrounds the pupil & regulates the passage of light through the opening.

Term

 

lacrimal apparatus

Definition

 

The structures that provide tears to wash the eye,

consisting of the lacrimal gland and

lacrimal sac with its ducts.

Term

 

 

lens

Definition

Clear, membrane-like structure that is found in the eye behind the iris and brings objects into focus.

Term

 

 

optic chiasma

Definition

Where the optic nerves cross over one another

and continue on to the primary

visual area of the occipital lobe.

Term

 

optic nerve

Definition

 

Nerve composed of the ganglion cell fibers that form the innermost layer of the retina.

Term

 

 

pupil

Definition

The opening in the center of the iris

that controls the amount of light entering the eye.

Term

 

 

retina

Definition

 

Innermost layer of the eyeball that contains the rod & cone cells.

Term

 

 

retinal

Definition

A form of vitamin A.

Term

 

 

rhodopsin

Definition

Light sensitive biochemical in the rod cells of the retina; visual purple.

Term

 

 

rod cell

Definition

dim-light receptor in the retina of the eye

that detects motion but not color.

Term

sclera

Definition

The white, fibrous outer layer of the eyeball.

Term

visual

accommodation

Definition

 

 Ability of the eye to focus at different distances by changing the curvature of the lens.

Term

 

 

vitreous humor

Definition

 

The jelly-like substance that occupies the

posterior chamber of the eye which functions in holding the retina in place & providing nutrients to the retina.

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