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Cards In This Set
| Front | Back |
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What system are the spinal nerves a part of, and how many pairs?
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PNS and 31 pairs containing both sensory and motor neurons
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Dorsal root contains what kind of neurons?
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Sensory
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Ventral root contains what kind of neurons?
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Motor neurons which are both voluntary and involuntary
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What exists when the ventral and dorsal roots come together?
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A spinal nerve which is about 1" long
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What is the dorsal root ganglion?
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It contains the cell bodies of sensory neurons
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What does the spinal nerve divide into?
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The dorsal ramus and the ventral ramus
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Describe the dorsal ramus
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Short and goes posteriorly
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Describe the ventral ramus
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Long, goes laterally, anteriorly and extends out into extremeties
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What is a nerve plexus?
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A network of nerves formed by ventral rami only (none are made in the thoracic area---ribs in the way)
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What are the nerve plexi
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Cervical, brachial, lumbar, sacral
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What are the cervical plexus?
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The phrenic nerve...to the diaphragm
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How many nerves in the brachial plexus?
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5, axillary, radial, musculocutaneous, ulnar, median
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What does the axillary nerve affect?
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The shoulder muscle (deltoid and teres minor)
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What doe the radial nerve affect?
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Posterior upper extremity, extensors
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What does the musculocutaneous nerve affect?
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The anterior arm, flexors and elbow
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