EYE Flashcards
give the three layers of the eyeball
FIBROUS TUNIC / LAYER (outermost structure) VASCULAR TUNIC / LAYER (inner structure) SENSORY LAYER (innermost structure)
this layer is Abundant in blood vessels
VASCULAR TUNIC / LAYER (inner structure)
this part of the eye contains
- Dark pigment (melanin)
- Prevents scattering of light
- makes sure that light reaches the retina
CHOROID
this the curved structure of the eye, facilitates light refraction/bending
CORNEA
shapes your eyeball, protects the inner layers of the eye
it is white in color
SCLERA
between ora serata and retina
- produces melanin
- helps in contracting and relaxing the lens (far and near sight)
CILIARY BODY
literally means rainbow
colored portion of the eye
regulates/adjust light that enters
between cornea and ciliary process
IRIS
what are the two layers of the retina
- pigmented layer- prevent scattering of the light
- neural layer- nerve cells/neurons
this part creates images and has two layers
photoreceptor layer
RETINA
CREATES AN IMAGE AS WE LOOK AT IT
PHOTORECEPTOR LAYER - CONE AND ROD
HOW DOES THE RETINA CREATE AN IMAGE
THROUGH LIGHT REFRACTION AND THE OPTIC NERVES
PHOTORECEPTOR CAN BE BRKOEN DOWN INTO TWO
cone and rod
this part of the photoreceptor layer is
- central
- colored vision
- colorful
CONE
this part of the photoreceptor
- edge/lateral/ peripheral
- gives sight in dark places
- night vision
- black
ROD
- Interprets image constructed by the retina
- Nerves from bipolar cell are transmitted to the horizontal cell.
- Nerves from horizontal nerve to the optic nerves.
- Optic nerves will be send to the brain for it to be interpreted.
BRAIN
- Abundant in photo receptors but most of them are cones particularly
- High vision since it has a lot of cones
- Clearest & sharpest vision
- optic disc
FOVEA CENTRALIS
- ‘blind spot’
- The opposite of Fovea Centralis
- No light accepted
- No photo receptors
OPTIC DISC
2 TYPES OF FUILD IN THE EYE
AQUAEOUS HUMOR
VITREOUS HUMOR / BODY
THIS FLUID IS
- Avascular
- Clear in color
- Near the lens and cornea
- Anterior to lens
AQUAEOUS HUMOR
THIS FLUID IS
- Posterior to lens
- Gives shape to the eye
- Prevent collapse to eye
VITREOUS HUMOR / BODY
name 6 extrinsic eye muscles
superior rectus lateral rectus superior oblique medial rectus inferior rectus inferior oblique
this eye muscle allows upward movement
superior rectus
this eye muscle allows outward movement
lateral rectus
this eye muscle allows outward and downward movement
superior oblique
this eye muscle allows inward movement
medial rectus
this eye muscle allows downward movement
inferior rectus
this eye muscle allows outward and upward
inferior oblique
