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20 Cards in this Set
- Front
- Back
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skeletal muscle is innervated by
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motor neurons (nerve cell)
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nerves are
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bundle of motor neuron axons
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each muscle is served by
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at least 1 nerve
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neuron axons branch into
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axon terminals (aka synaptic knobs + terminal bouton)
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2 other names for axon terminals
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synaptic knobs - terminal bouton
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a motor unit consists of
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a motor neuron and all muscle fibers it innervate
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small motor unit description
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1 motor neuron may supply only a few muscle fibers (4)
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large motor unit description
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1 single neuron may innervate several hundred muscle fibers
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each axon terminal forms a junction with a
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muscle fiber
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synaptic cleft description
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space between the axon terminal and the sarcolemma
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synaptic vesicles contain ____ & ____
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neurotransmitters - acetylcholine
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Acetylcholine (ACh) is produced and secreted by
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the neuron
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when a nerve impulse reaches the axon terminal it causes (3)
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calcium to enter the terminal - synaptic vesicles migrate towards neuron cell membrane - exocytosis of ACh into synaptic cleft
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when a nerve impulse reaches the axon terminal it causes calcium
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to enter terminal
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when a nerve impulse reaches the axon terminal it causes synaptic vesicles
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to migrate towards neuron cell membrane
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when a nerve impulse reaches the axon terminal it causes exocytosis of
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ACh into synaptic cleft
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3 motor end plate descriptions
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indented trough area on muscle fiber - ACh released by the axon terminal into cleft - numerous ACh receptors
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indented trough area on muscle called
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motor end plate
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site where ACh is released by the axon terminal into cleft
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motor end plate
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the motor end plate has numerous
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ACh receptors
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