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Nervous System
Neurology, medical terminology
| Term | Definition |
|---|---|
| antiepileptic | drug capable of preventing or stopping seizures |
| convulsion | alternate name for seizure |
| EEG | record of the electrical activity of the brain |
| epilepsy | chronic brain disorder due to excessive electrical activity |
| ictal | pertaining to, or caused by, stroke or seizure |
| motor | pertaining to nerves that cause movement or secretion |
| neurology | medical specialty of disorders of the nervous system |
| neurologist | one who specializes in diagnosis and treatment of disorders of the nervous system |
| seizure | event due to excessive electrical activity in the brain |
| tonic | in a state of muscular contraction |
| afferent | conducting impulses inward toward the spinal cord or brain |
| efferent | conducting impulses outward away from the brain or spinal cord |
| ganglion | collection of nerve cell bodies outside the CNS |
| nerve | a cord of fibers in connective tissue that conduct impluses |
| neuron | technical term for a nerve cell; cell body with dendrites and axons |
| plexus | a weblike network of joined nerves |
| visceral | pertaining to the internal organs |
| axon | single process of a nerve cell carrying impulses away from cell body |
| dendrite | branched extensions of a nerve cell that receive nervous stimuli |
| dopamine | neurotransmitter; plays a role in memory, pleasure, behavior, learning |
| endorphin | natural substance in the brain for pain relief |
| myelin | fatty sheath that covers the axon of the nerve |
| neurotransmitter | chemical agent that relays messages from one nerve cell to the next |
| serotonin | neurotransmitter; involved in mood, anxiety and sleep |
| synapse | junction between two nerve cells |
| astrocyte | star-shaped cell in the nervous system |
| blood-brain barrier | selective mechanism that protects the brain from toxins and infections |
| neuroglia | connective tissue holding nervous tissue together |
| oligodendrocyte | connective tissue cell of the CNS that forms a myelin sheath |
| white matter | regions of brain and spinal cord occupied by bundles of axons |
| brainstem | region of the brain responsible for vital functions like cardiovascular and respiratory mechanisms |
| cerebellum | most posterior area of the brain; responsible for balance and coordinated movement |
| cerebrum | major portion of the brain; divided into two hemispheres |
| corpus collosum | bridge of nerve fibers connecting two hemispheres |
| frontal lobe | anterior portion of the brain; memory, intellect, behavior, emotion |
| occipital lobe | posterior portion of the brain; visual images, sight |
| parietal lobe | receives and interprets sensory information- pain, pressure, touch, temperature |
| temporal lobe | interpretation of sensory input, sounds, speech |
| decussate | crossover; like the arms of an "X" |
| cauda equina | bundle of spinal nerves in the vertebral canal below the ending of the spinal cord |
| cervical | pertaining to the neck region |
| dermatome | the area of skin supplied by a single spinal nerve |
| intervertebral | the space between two vertebrae |
| meninges | three-layered covering of the brain and spinal cord |
| dementia | chronic, progressive, irreversible loss of the mind's cognitive and intellectual functions |
| aneurysm | dilation of an artery or cardiac chamber |
| hemiparesis | weakness of one side of the body |
| hemiplegia | paralysis of one side of the body |
| ataxia | inability to coordinate muscle activity, leading to jerky movements |
| quadriplegia | paralysis of all four limbs |
| spasm | sudden, involuntary movement of a muscle group |
| epilepsy | chronic brain disorder due to excessive neuronal discharge |
| postictal | occurring after a seizure |
| cephalalgia | pertaining to pain in the head |
| prion | small infectious protein particle |
| syncope | temporary loss of consciousness; fainting |
| concussion | mild head injury |
| insomnia | inability to sleep |
| Bell's palsy | paresis or paralysis of one side of the face |
| meningitis | inflammation of the membranes surrounding the brain and spinal cord |
| subdural | located in the space between the dura mater and arachnoid membrane |
| demyelination | process of losing the myelin sheath of a nerve fiber |
| paresthesia | abnormal sensation; for example tingling, burning, prickling |
| electroencephalogram | record of the electrical activity of the brain |