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Vocabulary WordDefintion
Neuron impulse conducting cell. functional unit of the nervous system
Soma cell body; nerve
Dendrite any of the short branched threadlike extensions of a nerve cell, which conduct impulses towards the cell body
Synapse the region of communication between neurons
Multipolar neuron neuron with one axon and three or more dendrites.
Bipolar neuron neuron that has two processes arising from opposite poles of the cell body
Unipolar neuron cell body that emits a single axonal process
Anaxonic neuron multiple dentrites and no axons
Schwann Cell a cell that forms spiral layers around a myelinated nerve fiber
Myelin sheath insulating covering that surrounds an axon with multiple spiral layers of myelin
Electrical potential the potential energy of a positive unit.
Current a flow of electric charge
Polarized fewer positive ions sitting on the inner face of the neuron’s plasma membrane than there are on its outer face in the tissue fluid that surrounds it
Neurotransmitter transmits nerve impulses across a synapse
Dopamine neurotransmitter in the brain and as an intermediate in the biosynthesis of epinephrine
Serotonin powerful vasoconstrictor and is found especially in the brain
Somatic reflex all reflexes that stimulate the skeletal muscles
Visceral reflex a reflex mediated by autonomic nerves and initiated in the viscera
Meninges The three membranes that enclose the vertebrate brain and spinal cord
Dura mater tough fibrous membrane that envelops the spinal cord and brain.
Gray matter The gray area of the central nervous system; contains
White matter White substance of the central nervous system; the myelinated nerve fibers.
Cerebrum the largest part of the brain; consists of right and left cerebral hemispheres
Cerebellum part of the hindbrain; involved in producing smoothly coordinated skeletal muscle activity
Gyrus an outward fold of the surface of the cerebral cortex
Sulcus a furrow on the brain, less deep than a fissure
Brainstem the portion of the brain consisting of the medulla, pons and midbrain
Cortex the outer suface layer of an organ
Blood-brain barrier a mechanism that inhibits passage of materials from the blood into brain tisues
Medulla oblongata the lowest or hindmost part of the brain, continuous with the spinal cord
Thalamus a mass of gray matter in the the diencephalon of the brain
Hypothalamus the region of the diecephalon forming the floor of the third ventricle of the brain
Occipital lobe lobe in the back of the brain. contains the visual area
Parietal lobe middle area of the brain contains the somatic sensory area
Frontal lobe in the front of the brain.
Created by: Tessa Elise



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