adjustment of the lens of the eye for close or distant vision

an expansion at the end of each semicircular canal that contains a crista ampullaris

watery fluid that fills the anterior cavity of the eye

bones of the middle ear

the tube that connects the middle ear cavity to the pharynx; Eustachian tube

an ear-like structure

a receptor that is stimulated by the binding of certain chemicals

the vascular, pigmented middle layer of the wall of the eye

structure associated with the choroids layer of the eye that secretes aqueous humor and houses the ciliary muscle

portion of inner ear that has hearing receptors

color receptor in the retina of the eye

membranous covering on the anterior surface of the eye and lining the eyelids

transparent anterior portion of the outer layer of the eye wall

sensory organ in a semicircular canal that functions in the sense of dynamic equilibrium

maintenance of balance when the head and body are suddenly moved or rotated

tympanic membrane; a thin membrane that covers the auditory canal and separates the external ear from the middle ear

region of the retina, consisting of densely packed cones, that provides the greatest visual acuity

color, muscular portion of the eye that surrounds the pupil and regulates its size

the system of connecting tubes in the inner ear, including the cochlea, vestibule, and semicircular canals

tear-secreting gland

sensory receptors that sense mechanical stimulation, such as changes in pressure or tension

pertaining to the sense of smell

region in the retina where nerve fibers (axons) exit, becoming part of the optic nerve

opening between the stapes and the inner ear

sensory nerve endings associated with pain

sensory receptors sensitive to light energy; rods and cones of the eyes

process by which the brain causes a sensation to seem to come from the region of the body being stimulated

opening in the iris through which light enters the eye

pain that feels as if it is originating from a part other than the site being stimulated

a bending of light as it passes between media of different densities

inner layer of the eye wall that includes the visual receptors

light-sensitive pigment in the rods of the retina; visual purple

receptors that provide colorless (black and white) vision

a membrane-covered opening between the inner ear and the middle ear

an enlarged region of the membrane labyrinth of the inner ear

white, fibrous outer layer of the eyeball

tubular structures of the inner ear that house receptors providing the sense of dynamic equilibrium

a feeling resulting from the brain's interpretation of sensory nerve impulses

sensory recepts becoming unresponsive or inhibition along the CNS pathways leading to sensory regions of the cerebral cortex

the maintenance of balance when the head and body are motionless

organ including receptors associated with the sense of taste

a sensory receptor sensitive to temperature changes; heat and cold receptors

an enlarged portion of the membranous labyrinth of the inner ear

fluid between the lens and the retina of the eye