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PSY 220 Chapter 7: Movement correctly answered already passed
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PSY 220 Chapter 7: Movement correctly answered already passed
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PSY 220 Chapter 7: Movement correctlyanswered already passed
Basal Ganglia
Involved in gating and proper initiation of movement
Cerebellum
Involved in sensory-motor coordination
Motor cortex
Involved in planning, initiating and directing voluntary movement
Brainstem centers
Involved in basic movement and postural control
Local circuit neurons
lower motor neuron integration that are involved in reflex coordination
Basal Ganglia and Cerebellum --> Motor Cortex and Brainstem centers --> local circuit neurons --> motor
neuron pools --> skeletal muscles
The hierarchy of overlapping systems of motor control
, fibers
Skeletal muscles are composed of many individual
One axon (axon may innervate many muscle fibers)
Each muscle fiber receives info from
Neuromuscular junction
A synapse between a motor neuron axon and a muscle fiber
Acetylcholine
Neurotransmitter that is released by motor neuron and excites the skeletal muscle to contract
Myasthenia gravis
Autoimmune neuromuscular disorder characterized by variable weakness of voluntary muscles with
symptoms that improve with rest and worsen with activity
the immune system forms antibodies that attack ACh receptors at the postsynaptic neuromuscular
junctions (not enough ACh to make strong muscle contractions)
Myasthenia gravis occurs when
cholinesterase inhibitors (increase ACh availability) or immunosuppressants
Myasthenia gravis is treated with
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