motor nervous system (nervous system exam 4)
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what are the two stuctural divisions of the motor nervous system and what are they based on?
the upper and lower motor component
they are based on anatomical location of neurons
what does the lower motor component of the motor nervous system consist of?
a. cell bodies in anterior gray horn of spinal cord
b. motor nuclei of cranial nerves
what does the upper motor component of the motor nervous system consist of?
motor neurons of cerebral cortex & cerebral nuclei
what are the two functional divisions of the motor nervous system and what are they based on?
- 1. pyramidal system
- 2. extrapyramidal system
they are based on type of control
which functional system controls conscious, coluntary motor activity?
which functional system consists of motor neurons in the pre-central gyrus
--nerve fibers form the corticospinal tracts
which functional system descends without synapsing to the spinal cord
--a single neuron from brain to spinal cord level of exit
which functional system controls subconscious, voluntary motor activity
1. muscle tone
2. automatic expressions
3. emotional expressions
which functional system consists of motor neurons in basal nuclei and reticular formation?
1. nerve fibers form other motor tracts such as:
2. actions of these motor nuclei controlled by motor neurons of cerebral cortex
which functional system has 2 neurons from cerebral cortex to spinal cord?
1. 1 from cerebral cortex to basal nuclei or reticular formation
2. second neuron from nuclei to spinal cord
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