Shared Flashcard Set

Details

VISION
Chapter 17
39
Anatomy
Undergraduate 1
05/14/2008

Additional Anatomy Flashcards

 


 

Cards

Term
Vision
Definition

Humans Dominant sense

70% OF ALL SENSORY receptors are in the eye.

Term
Eyelids/Palpadrae
Definition

Keeps the surface of the eye lubricated

Protects the eye

Term
MEdial and Lateral Canthus
Definition
Where the eyelids connect
Term
Palpabrael fissure
Definition

separate the free margins of the upper and lower eyelid

The space where you can see your eyeball

Term
Meibobian gland
Definition
Prevents the eyelashes from sticking together
Term
Lacrimal appratus
Definition

contains the lacrimal gland

makes tears

drains tears into lacrimal sacs

Term
Conjunctiva
Definition

Epithelium that covers the inner surface of the eye

Also a mucous membrane covered by a stratified squamous epithelium

Produces lubrication

Term
Pupil
Definition

The black part of the eye

very center

Term
Iris
Definition

The colored part of the eye

Pigmented, contain the muscle that contract and change the shape of the pupil.

Term
Extrinsic Eye Muscles
Definition

Two parts

Rectus Muscle

Oblique muscle

Term

Layers of the eye

superficial to deep

Definition
  1. Cornea
  2. Sclera
  3. Choroid
  4. Retina
  5. Macula
  6. Fovea
Term
Fibrous Tunic
Definition

Contains the Sclera, Cornea, and dense connective tissue

Physical protection and support.

Term
Sclera
Definition

Attatchment place for the eye, sclera has small blood vessels and nerves that penetrate sclera to reach inner structures

WHITE PART OF THE EYE

Term
Cornea
Definition

Dense matrix with multiple layers of collagen fibers,

avascular

focuses and bends light

hard to repair

Term

Vascular Tunic

(uvea)

Definition

Iris, cilliary body and the Choroid

carries blood vessels and secretes aqueous humor

regulates the amount of light entering the eye

controls the shape of the lens.

Term
eye color
Definition
Genes that influence density and distribution of melanocytes determine..
Term
Green, brown, and black
Definition
These have increasing number of melanocytes
Term
Neural Tunic
Definition

Contains photoreceptors Rods and Cones

Innermost, pigmented layer

Absorbs light

Contains supporting cells and neurons that perform preliminary processing and integration of visual information.

Term
Rods
Definition

Black and White

Highly sensitive to light

allow us to see in the dark

indistinct vision

125 million of these form a band around the periphery of the retina.

Term
Cones
Definition

Color Vision

Three types of cones are present

(red, yellow, blue)

Different combinations provide us with different colors

Term
Fovea Centralis
Definition
Site of the sharpest vision
Term
Optic Discs
Definition

One million ganglion converge here

Blind spot

Term
Opsin
Definition

Determines the wavelength of light the retinal absorbs

Works differently with different cones

Term
PhotOpsin
Definition
Amino acid sequence that determines the wavelength of the light.
Term
RhodOpsin
Definition

Absorbs light it accumulates in the dark

Consists of retinal and opsin

Light breaks them into their separte isomers and puts them back together in the dark.

Term
Aqueous Humor
Definition

Fluid that circulates within the anterior cavity

passing from the posterior to anterior chambers.

Term
Vitreous Humor
Definition

Jelly like, helps with the shape of the eye

held to the eye by retina

Term
Philosophy of vision
Definition

The electromagnetic spectrum holds all waves of energy

Visible light is the only wave that we can physically see.

Term
Reflexion
Definition

Light bouncing off an object

we see colors because of this

Term
Refraction
Definition
bending of light due to it slowing down during travel.

travels slower because of different densities
Term
Lens
Definition
Posterior to cornea

primary function to focus on the visual image on the photoreceptrs
Term
Focal Point
Definition
Specific point of intersection on the retina.
Term
Focal Distance
Definition
The distance between the center of the lens and focal point
Term
Myopia
Definition
Nearsightedness
Term
Hyperopia
Definition
Farsightedness
Term
Retinal
Definition
Synthesized from Vitamin A, light absorbing, has two isomers. (CIS AND TRANS)
Term
CIS
Definition
Segment of Vision is normal and bends
Term
TRANS
Definition
Segment is straightened when it should be bents
Term
Bleaching
Definition
Light gets changed from CIS to TRANS

(goes from purple to clea)
Supporting users have an ad free experience!