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| Chemical neurotransmitter |
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| May have a genetic basis, also evidence indicates that environmental factors play a role |
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| Irregularity in the cornea or lens |
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| Can make plane rides uncomfortable if clogged |
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| Part of the ear attached to the side of the head |
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Definition
| Considered part of the peripheral nervous system |
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| Takes info away from the cell body |
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| Temporary or permanent paralysis of facial features caused by damage to cranial nerve VIII (facial nerve) |
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| Fluid filled complex maze of three spaces in the temporal bone (vestibule, semicircular canals and the cochlea) |
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| The lens becomes milky in appearance; tends to be inherited; can be treated by implant surgery; caused by cloudy spots in the lens of the eye |
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| Network of brain capillaries that are involved with the production of cerebrospinal fluid |
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| Second largest part of the human brain; lies under the occipital lobe of the cerebrum; an essential part in the production of movements |
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| Most common crippling diseases that can appear during childhood; results from damage to brain tissue from reduced oxygen supply to the brain |
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| Caused by an x-linked genetic trait, occurs more often in men than women |
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| Photoreceptor cells; for daytime vision |
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Definition
| Mucous membrane, lines the underside of the eyelids and covers the sclera in front |
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Definition
| Mucous membrane, lines the underside of the eyelids and covers the sclera in front |
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| Considered the window of the eye |
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| Morphine like neurotransmitter; natural pain killers |
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| Morphine like neurotransmitter; natural pain killers |
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| Recurring or chronic seizure disorder |
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| Curved tube extending from the auricle into the temporal bone, ending at the tympanic membrane |
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| Extends into the temporal bone and ends at the tympanic membrane |
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| Disorder characterized by elevated intraocular pressure in the eye |
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| Supporting cells of nervous tissue |
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| Plays a crucial part in maintaining body temperature; serves in regulating water balance and produces anti-diuretic hormones |
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| Also called the "anvil" because it is shaped like an anvil |
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| Called central or connecting neurons |
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| Causes permanent blindness in the elderly |
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| Called the "hammer," a tiny middle ear bone that is shaped like a hammer |
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| Vital centers are located here (Ex: cardiac, respiratory and vasomotor centers) also part of the brainstem |
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| Chronic inner ear diseases of unknown cause; characterized by tinnitus, progressive nerve deafness and vertigo (sensation of spinning) |
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| One of the three parts of the brainstem |
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| Neurons that transmit nerve impulses from the brain and spinal cord to the muscles |
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| Most common primary disease of the CNS; considered a myelin disorder; most common in women between 20 and 40 years of age; causes oligodendrocyte injury and death |
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| A group of peripheral nerve fibers bundled together like strands of a cable |
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| Helps regulate body function, as does the endocrine system |
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| Hormone secreted by the adrenal medulla; released by the sympathetic nervous system |
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| Malignant tumor of the sympathetic nervous system |
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| Inherited bone disorder involving structural irregularities of the stapes in the middle ear and characterized by tinnitus progressing to deafness |
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| Chronic nervous disorder resulting from a deficiency of the neurotransmitter dopamine |
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Term
| Peripheral Nervous System |
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| A subdivision of this is the autonomic nervous system; includes the cranial and spinal nerves |
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| The part of the brainstem between the medulla oblongata and the midbrain |
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| The opening in the center of the iris that regulates the amount of light entering the eye |
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Definition
| Part of the retina becomes detached |
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| Photoreceptors; used for night vision |
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| Neuralgia (nerve pain) of the sciatic nerve |
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| Located in the inner ear; contain a specialized receptor called crista ampullaris that generates a nerve impulse on movement of the head |
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| Special sense and also a chemoreceptor |
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| A chemoreceptor; there are four sense of tastes; generated by receptor cells called gustatory cells |
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Definition
| Neurotransmitter that belongs to a group of compounds called catecholamines |
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Definition
| Viral infection resulting in reactivation of the varicella virus (chickenpox) |
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Definition
| Lies inside the spinal cavity, extends from the occipital bone down to the bottom of your first lumbar vertebrae |
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| Tiny, stirrup shaped bone in the middle ear |
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| Also called a CVA, cerebrovascular accident |
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| Produces sensations; associates sensations with emotions and plays a part in the so-called arousal or alerting mechanism |
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| Also called tic douloureux |
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| Located in the inner ear; portion adjacent to the oval window between the semicircular canals and the cochlea |
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