Chap 21 The Sensory System
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44 terms
Terms | Definitions |
|---|---|
 accommodation | ...adjustment, as the accommodation of the lens of the eye. |
| aqueous humor | ...liquid that flows through the anterior and posterior eye chambers in the space between the cornea and the lens. |
| astigmatism | ...condition in which the eye cannot bring horizontal and vertical lines into focus at the same time, causing blurry vision, as a result of irregularities in the curvature of the cornea and lens. |
| auricle | ...flap of cartilage and skin that comprises the outer ear; external ear, pinna. A portion of the atrium of the heart. (Sometimes used to refer to entire atrium.) |
| cochlea | ...snail-shaped organ of the inner ear; the essential organ of hearing. |
| cones | ...specialized neurons concentrated in the retina's center that receive color, add visual acuity, and require a significant amount of light to function. |
| conjunctiva | ...transparent mucous membrane covering the anterior eye (front). |
| cornea | ...the transparent front covering of the eye, as in corneal transplant |
| eustachian tube | ...the passage from the throat to the middle ear; auditory tube. |
| gustation | ...sense of taste |
| hyperopia | ...condition in which light rays focus behind the retina; farsightedness. The eyeball is too short and one cannot see objects clearly. |
| incus | ...the "anvil," one of three tiny bones within the middle ear which are set in motion by sound waves. |
| iris | ...pigmented section over the front of the eyeball that gives the eye its color. |
| labyrinth | ...the inner ear, including the vestibule, cochlea, and semicircular canals. |
| lacrimal gland | ...pertaining to tears, as the lacrimal glands of the eyes. |
| lens | ...a transparent, crystalline eye structure that converges or scatters light rays before they focus as images on the retina. |
| malleus | the "hammer," one of three tiny bones within the middle ear which are set in motion by sound waves |
| membranous labyrinth | ...set of tunnels and chambers in the inner ear. |
| myopia | ...nearsightedness; light rays focus in front of the retina. |
| olfaction | ...sense of smell |
| ophthalmology | ...medical specialty related to the study of the eye and vision |
| optic disk | ...eye region that is not light sensitive |
| orbit | ...ball-shaped cavity in the skull that contains the eye. |
| organ of Corti | ...small but intricate organ in the inner ear where the transmission of nerve stimuli begins |
| ossicle | ...collectively, the three tiny bones in the middle ear (the malleus, incus, and the stapes) which are set in motion by sound waves. |
| otology | ...study of the anatomy and physiology of the ear and related disorders |
| pinna | ...external ear; auricle. Gathers and guides sound waves |
| presbycusis | ...hearing loss that occurs with aging |
| presbyopia | ...farsightedness that occurs with aging |
| proprioceptor | ... |
| ptosis | ...drooping or sagging of an organ or part from its normal position (usually refers to eyelid) |
| pupil | ...black center of the eye that regulates the amount of light that enters it |
| retina | ...the innermost tunic of the eyeball that contains rods and cones and is the origin of the optic nerve. Light rays focus at the retina in normal vision. |
| rods | ...specialized neurons dispersed throughout the retina, suited to dim light and especially useful in night vision |
| sclera | ...outer coating of the eyeball |
| semicircular canal | ...section of the inner ear that contains hairlike nerve endings that respond to movement and control the sense of balanc |
| stapes | ...the "stirrup," one of three tiny bones within the middle ear which are set in motion by sound waves |
| tinnitus | ...ringing in the ears. |
| tympanic membrane | ...eardrum |
| vertigo | sensation of rotation or movement of self (subjective vertigo) or surroundings (objective vertigo). (Not all dizziness is true vertigo.) |
| vitreous humor | a transparent, gelatin-like material that fills the space behind the lens of the eye |
| Trigeminal | nerve carries sensations of eye pain and temperature to the brain. |
| tactile | receptors are located in the areas such as the fingertips and around the lips, constantly receiving nerve impulses with regard to pain and pleasure. |
| Visceral | pain located in an internal organ system. |
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