Term
| 31 pairs of peripheral nerves |
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Definition
| 31 pairs of nerves: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal |
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Term
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Definition
each nerve has an anterior (ventral) root containing motor fibers and a posterior (dorsal) root containing sensory fibers
anterior and posterior roots merge to form a short spinal nerve, less then 5mm long |
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Term
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Definition
lie in the motor strip of he cerebral cortex and in several brainstem nuclei
their axons synapse with motor nuclei in the brainstem (for cranial nerves) and spinal cord (for peripheral nerves) |
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Term
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Definition
have cell bodies in the spinal cord (anterior horn cells)
their axons transmit impulses through the anterior roots and spinal nerves, into peripheral nerves, terminating at the neuromuscular junction |
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Term
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Definition
| the band of skin innervated by the sensory root of a single spinal nerve |
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Term
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Definition
corticospinal (pyramidal) tract
basal gangia system
cerebellar system |
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Term
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Definition
stimulate selected muscle action
carry impulses that inhibit muscle tone
originate in the motor cortex of the brain |
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Term
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Definition
| helps maintain muscle tone and to control body movements, especially gross autonomic movements such as walking |
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Term
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Definition
| receives both sensory and motor input and coordinates motor activity, maitains equilibrium and helps control posture |
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