The Sense Organs
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| auditory nerve | either one of the eighth pair of cranial nerves, consisting of sensory fibers that conduct impulses from the organs of hearing and from the semicircular canals to the brain
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| cochlea | a spiral-shaped cavity forming a division of the internal ear in humans and in most other mammals
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| cones | one of the cone-shaped cells in the retina of the eye, sensitive to color and intensity of light
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| convex | having a surface that is curved or rounded outward
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| cornea | the transparent anterior part of the external coat of the eye covering the iris and the pupil and continuous with the sclera
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| ear canal | hollow tube of the outer ear that leads inward
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| eatdrum | a membrane in the ear canal between the external ear and the middle ear; tympanic membrane
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| Eustachian tube | a canal extending from the middle ear to the pharynx; auditory canal
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| inner ear | the organ of hearing and equilibrium in vertebrates, in humans consisting of an external ear that gathers sound vibrations, a middle ear in which the vibrations resonate against the tympanic membrane, and a fluid-filled internal ear that maintains balance
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| iris | the contractile, circular diaphragm forming the colored portion of the eye and containing a circular opening, the pupil, in its center
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| middle ear | the middle portion of the ear, consisting of the tympanic membrane and an air-filled chamber lined with mucous membrane, that contains the malleus, incus, and stapes
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| optic nerve | either one of the second pair of cranial nerves, consisting of sensory fibers that conduct impulses from the retina to the brain
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| outer ear | the outer portion of the ear, consisting of the auricle and the canal extending to the tympanic membrane
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| pupil | the expanding and contracting opening in the iris of the eye, through which light passes to the retina
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| retina | the innermost coat of the posterior part of the eyeball that receives the image produced by the lens, is continuous with the optic nerve, and consists of several layers, one of which contains the rods and cones that are sensitive to light
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| rods | function to distinguish different shapes in dim light
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| semicrcular canals | set of three bony canals in each inner ear
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| sense organs | a specialized bodily structure that receives or is sensitive to internal or external stimuli; receptor
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| taste buds | one of numerous small, flask-shaped bodies, chiefly in the epithelium of the tongue, which are the end organs for the sense of taste.
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