Nervous System Key Terms Flashcards
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The all-or-none electrical event in the neuron
Action Potential
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Nerve fibers that carry messages to the CNS
Afferant fibers
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portions of the nervous system that controls the visceral orgrans
autonomic nervous system
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nerve fiber that conducts a nerve imulse away from the cell body
axon
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portion of the brain that includes the mid brain, pons, and medulla
brain stem
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Major portion of the body of a nerve cell
cell body
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part of the nervous system that includes the brain and spinal cord
Central Nervous system
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portion of the brain that is concerned with fine coordination of skeletal muscle
cerebellum
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superior aspect of brain, contains motor cortex
cerebrum
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capacity for conduction
conductivity
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portion of nerve fiber that sends action potentials toward nerve cell body
dendrites
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nerve fibers that carry information from the CNS to the periphery NS
efferent fibers
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Graded depolarization of the post-synaptic cleft by a neurotransmitter
excitatory postsynaptic potentials
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Tension receptor located within a series of muscles
Golgi Tendon Organs
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the maintenance of the constant internal enviorment
homeostasis
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Moves post-synaptic membrane farther from the threshhold
inhibitory postsynaptic potentials
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trait of certain tissues that enable them to respond to stimuli
irritability
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Perception of movement obtained from information about the position and rate of movement of th joints
kinesthesia
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Associated with the voluntary control of movement
motor cortex
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Somatic neuron that innervates skeletal muscle tissue
motor neuron
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A motor neuron and all the muscle fibers innervated by that single motor neuron
motor unit
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Muscle stretch receptor oriented parallel to skeletal muscle fibers
muscle spindle
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nerve cell
neuron
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Chemical messenger used my neurons to communicate with eachother
neurotransmitter
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portion or ANS that releases NT
parasympathetic nervous system
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portion of nervous system located outside of spinal cord and brain
peripheral nervous system
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Receptors that provide information on body movements and postions
proprioceptors
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When extensor muscles are contracted, reflex in flexor muscles
reciprocal inhibition
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Voltage difference measured across membrane
resting membrane potentials
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Form the myelin sheathe
Schwann cell
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Progressive activation of neurons starting with smallest and working up to bigger ones
size principle
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The additive effect of numerous inputs on a neuron
spatial summaton
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Portion of ANS that release norepinephrine and epineprine from adrenal glands
sympathetic nervous system
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Junctions between nerve cells
synapses
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Change in membrane potential produced by the addition of 2 or more inputs
temproal summation
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Sensory organ that consists of 3 semicircular canals
vestibular apparatus
