Terms in this set (41)
the bony cavity in the skull containing the eyeball
The ___ is the hair that grows on the bony ridge above the eye.
Skin that distributes moisture and protects the eyes against dust and light.
any of the short curved hairs that grow from the edges of the eyelids
membranous covering on the anterior surface of the eye
A gland located in the outer corner of each eyelid. It washes the anterior surface of the eye with fluid called tears.
a duct that carries tears from the lacrimal sac to the nasal cavity
extrinsic muscles of the eye
muscles responsible for moving the eye within the orbital socket, muscles that help the iris control the amount of light entering the pupil
tough, fibrous, white outer coat extending from the cornea to the optic nerve
transparent anterior portion of the outer covering of the eye
vascular layer beneath the sclera that provides nourishment to the outer portion of the retina
ring of muscle behind the peripheral iris that controls the power of the lens
the color part of the eye; made of muscle that contracts/relaxes to control the size of the people allowing light to enter the eye
outer of the retina, pigmented with melanin epithelial cells that absorb light and prevent it from scattering
Retina, inner layer on posterior eyeball lacation for visual receptors
area consisting of a small depression in the retina containing cones and where vision is most acute
Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is thus insensitive to light.
fluid-filled space between the cornea and iris
space between the back of the iris and the front of the vitreous chamber; filled with aqueous humor
a clear, watery fluid that fills the space between the cornea and iris
soft, jelly-like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball
the transparent structure behind the pupil that changes shape to help focus images on the retina
nerve responsible for carrying impulses for the sense of sight from the retina to the brain
an increase in the size of an aperture like the pupil in the iris of the eye
pupillary reflex constricts to pupils to prevent divergent light rays from entering eye
multiple/different layers of rod and cone cells, pigments are at very bottom layer
How does the eye develop?
From a lateral outgrowth of the brain
What nervous system are the retina and optic nerve in?
Central Nervous System
What kind of layer is the middle layer of the eye?
How many layers of the eye are there?
How are the chambers of the eye separated?
What chamber is the aqueous humor found in?
What is the posterior-most chamber?
What chamber has the vitreous humor?
The vitreous chamber
Function of the eye
refraction and transmission of light waves to the photoreceptor cell of the retina
What controls light hitting the retina?
The Autonomic nervous system
Why do the eyeballs rotate medially?
To allow better focusing of light when viewing an abject close up
What is the papillary light reflex used for?
evaluating neurological dysfunctions
How does the visual response start?
Stimulation of the photoreceptor cells of the retina as light reaches them and generates impulses
Where do the impulses in the retina go to?
They pass on to the optic nerve and then to the visual centers in the cortex (occiptal lobe)
What is the visual pathway?
Retina > optic nerve > optic chiasm > optic tract > lateral geniculate (thalamus) > optic radiations > visual (occiptal) cortex
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