Eye Anatomy Flashcards
Extraocular
means out side of the eye
Intraocular
means within the eye
Choroid
opaque middle layer, contains many blood vessels provides the blood supply for the entire eye. Most reflective surface
Sclera
White of the eye. Delicate layer. Maintain the the shape of the eye. covered by conjunctiva.
Retina
Sensitive innermost layer lines posterior segment of the eye. Receives never impulses and transmits them to the brain.
Ocular Adnexa
Orbit, eye muscles, eyelids, eyelashes, conjunctiva and lacrimal apparatus.
6 eye muscles
Lateral rectus, medial rectus, superior oblique, Inferior oblique, superior rectus and inferior rectus.
Lateral rectus
moves in lateral direction, pulled away from the nose
medial rectus,
moves eye toward the nose horizontally
superior oblique
moves eye downward and away from the nose. Medial rotation
Inferior oblique
moves the eye upward and towards the nose. Lateral rotation
superior rectus
attached at the top of the eye and It moves the eye upwards
inferior rectus
It moves the eye downward. Muscle attached at the bottom of the eye.
Lacrimal Gland
secrete tears
lacrimal sac
enlargement of the upper portion of the lacrimal duct
lacrimal duct
the passageway that drains excess tears into the nose
Crystalline lens
is clear, flexible, curved structure that focuses images on the retina
Epithelium
To block foreign object from entering the eye. Absorbs nutrient for the cornea
Bowman’s layer
Function is still unknown. Can’t guarantee vision when healing. Contains collagen.
Stroma
the thickest layer. Contains collagen and water (78%). Maintained my crystalline protein
Descemet’s Membrane
Can regenerate. Barrier against infection and Injury.
Endothelium
last layer doesn’t regenerate. Pumps excessive fluid.
Esotropia
horizontally move inward towards the nose
Exotropia
horizontally moves outward away from the nose
Hypertropia
vertically move upward
Hypotropia
vertically one eye moves downward
Diplopia
also known as double vision. Perception of 2 images of a single object
Outline the flow of Aqueous Humor
This fluid is constantly filtered starting from the posterior chamber through the pupil to the anterior chamber exiting the inner through the trabecular meshwork which consist of tiny pores until it reaches the Schlemm’s canal. From there it drains out of the eye through the aqueous veins and enters the sclera.
Puncta
Act like little valances to take tears out of the eye
Vitreous humor
This is a soft, clear, jelly like mass that contains millions of fine fibres. These fibers, which are attached to the surface of the retina, help the eye maintain its shape
Rods and cones
The rods and cones of the retina receive images that have passed through the lens of the eye. These images are converted into nerve impulses and transmitted to the brain
Macula
Is a clearly defined yellow area in the centre of the retina. This is the area of sharpest central vision
fovea centralis
Is a pit in the middle of the macula. Colour vision is the best in this area because It contains a high concentration of cones
Optic disc
Also known as a blind spot, is a small region in the eye with a nerve endings of the retina enter the optic nerve.
Optic nerve
Transmits these nerve impulses from the retina to the brain
Uveal Tract
Is the pigmented layer of the eye. It has rich blood supply in consist of the choroid, ciliary body, and the iris
Aqueous chamber
Located behind the cornea and in front of the iris
Ciliary body
Located in the choroid, is a set of muscles and suspensory ligaments that adjust the thickness of the lens to refines the focus of light in the retina
Accommodation
The process whereby the eye makes adjustments for seeing objects at various distances
Refraction
Is the ability of the lens to bend light rays so they focus on the retina
What is ocular mobility?
To see how eye muscles work together in various direction and gaze (12 muscles rectus and oblique)
What is the meaning of coming word Blephar/o
Eyelid
Some ophthalmic solutions may lose their potency if not stored properly
Ture
What is the meaning of ocul/o
eye