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Glossary of The Sensory System

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The vascular, pigmented middle tunic of the eyeball
Choroid
A vision receptor that is sensitive to color
Cone
The part of the eye that light rays pass through first as they enter the eye
Cornea
Membrane that lines the eyelids
Conjunctiva
Another name for the "blind spot", the region where the optic nerve connects to the eye
Optic Disk
Innermost coat of the eyeball, the nervous tissue layer that include the receptors for the sense of vision
Retina
A vision recetor that functions well in dim light
Rod
Structure that alters the shape of the lens for accomodation
Ciliary Muscle
The watery fluid that fills much of the eyeball in front of the crystalline lens
Aqueous Humor
Two sets of muscle fibers that regulate the amount of light entering the eye
Iris
The jelly-like material located behind the crystallinelens that maintains the spherical shape of the eyeball
Vitreous Body
A pigment needed for vision
Rhodopsin
The depressed area in the retina that is the point of clearest vision
Fovea Centralis
The fluid contained within the membranous labyrinth of the inner ear
Endolymph
The bone that interacts with the tympanic membrane
Malleus
Another name for the projecting part, or auricle, of the ear
Pinna
The channel connecting the middle ear cavity with the pharynx
Eustachian Tube
The fluid of the inner ear contained within the bony labyrinth and surrounding the membranous labyrinth
Perilymph
Cilitated receptor cells that detect sound waves
Organ of Corti
The skeleton of the inner ear
Bony Labyrinth
The sense of knowing the position of the head in relation to gravity
Static Equilibrium
Smaal crystals that activate maculae
Otoliths
The receptor cells in dynamic equilibrium
Cristae
Two small chambers containing maculae
Vestibule
The branch of the vestibulocochlear nerve that carries hearing impulses
Cochlear Nerve
The nerve that carries visual impulses from the retina to the brain
Optic Nerve
The branch of fifth cranial nerve that carries impulses of pain, touch, and temperature from the eye to the brain
Ophthalmic Nerve
The largest of the three cranial nerves that carry motor fibers to the eyeball muscles
Oculomotor Nerve
The sense of knowing the position of one's body and the relative positions of different muscles
Proprioception
The sense of body movement
Kinesthesia
A person who lacks cones in the retina will experience
Color Blindness
The organ of the Corti is the receptor for
Hearing
Receptors that detect changes in temperature
Free Nerve Endings
A term related to the sense of taste
Gustatory
Alterations in the lens' shape to allow foe near or far vision
Accomodation
The term lacrimation refers to the secretion of
Tears
Pain killers are released from certain regions of the brain are
Endorphins
A serious eye infection of the newborn that can be prevented with a suitable antiseptic
ophthalmia neonatorum
The scientific name for nearsightedness, in which the focal point is in front of the retina and distant objects appear blurred
myopia
The visual defect caused by irregularity in the curvature of the lens or cornea
astigmatism
Condition in which the eyes do not work together because the muscles do not coordinate
strabismus

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