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Sense Organs: The Eye and the Ear Vocab 1B (Normal Structure & Function)
Terms in this set (45)
Normal adjustment of the eye to focus on objects from far to near; ciliary body adjusts the lens, pupil constricts.
Area posterior to the cornea and anterior to the lens and iris.
Contains aqueous humor.
fluid produced by the ciliary body and found in the anterior chamber
consisting of two surfaces that are rounded, elevated, and curved evenly
Ex: lens of the eye (body)
middle, vascular layer of the eye, between the retina and the sclera
Structure on each side of lens that connects choroid and iris.
Contains ciliary muscles (controls lens shape) and secretes aqueous humor.
Photoreceptor cell in the retina.
Transforms light energy into a nerve impulse.
Responsible for color and central vison.
Delicate membrane lining the eyelids and covering the eyeball
Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball.
tiny pit or depression in the retina that is the region of clearest vision
fundus of the eye
posterior, inner part of the eye; visualized with an ophthalmoscope
Pigmented layer that opens and closes to allow more or less light into the eye.
Central opening is pupil
Transparent biconvex body posterior to the pupil of the eye.
Refracts light rays to bring them into focus on the retina.
Yellowish region on the retina lateral to and slightly inferior to the optic disc.
Contains fovea centralis (area of clearest vision).
point at which optic nerve fibers cross in the brain
Region at the back of the eye where the optic nerve meets the retina.
Blind spot of the eye (insensitive to light, no photoreceptors)
cranial nerve carrying impulses from the retina to the brain (cerebral cortex)
Central opening of the eye, surrounded by the iris, through which light rays pass.
bending of light rays by the cornea, lens and fluids of the eye, bringing rays into focus on the retina
light-sensitive nerve layer of the eye containing photoreceptor cells (rods and cones)
photoreceptor cell of the retina essential for vision in low (dim) light and for peripheral vision
tough, white outer coat of the eyeball
relay center of the brain where optic nerve fibers pass through on their way to the cerebral cortex
Soft, jelly-like material behind the lens in the vitreous chamber.
Helps maintain shape of eyeball.
external auditory canal
channel that leads from the pinna to the eardrum
external auditory meatus
auditory nerve fibers
Carry impulses from the inner ear to the brain (cerebral cortex)
Compose the vestibulocochlear nerve (cranial nerve VIII)
channel between the middle ear and the nasopharynx; eustachian tube
flap of the ear; the protruding part of the external ear, or pinna
waxy substance secreted by the external ear; earwax
snail shell-shaped, spirally wound tube in the inner ear; contains hearing-sensitive receptor cells
fluid within the labyrinth of the inner ear
Second ossicle (small bone) of the middle ear
maze like series of canals of the inner ear
(cochlea, vestibule, semicircular canals)
First ossicle of the middle ear
Organ of Corti
Sensitive auditory receptor area found in the cochlea of the inner ear
small bone of the ear
malleus, incus, stapes
membrane between the middle ear and the inner ear
fluid contained in the labyrinth of the inner ear
auricle; flap of the ear
passages in the inner ear associated with maintaining equilibrium
Third ossicle of the middle ear
membrane between the outer and the middle ear; also called the eardrum
Central cavity of the labyrinth, connecting the semicircular canals and the cochlea.
Contains the saccule and utricle, which help maintain equilibrium.
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