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extends from Foramen Magnum to 2nd Lumbar Vertebrae
Cervical enlargement; supplies upper limbs
Lumbar enlargement; supplies lower limbs |
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tough outter covering
thickest most superficial layer |
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middle layer
thin and wispy
spiderweb like appearance |
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innermost layer
bound to surface of brain and spinal cord |
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| anchors spinal cord to the coccyx |
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space outside dura
in spine; contains spinal nerve roots |
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space btw dura mater and arachnoid mater
in spine; contains small amount of serous fluid |
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space btw arachnoid and pia mater
in spine; contain cerebrospinal fluid and blood vessels |
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| attaches spinal cord to dura |
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myelinated axons
in brain; deeper
in spinal cord; outer layer |
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unmyelinated axons
in brain; outer cortex and inner nuclei
in spinal cord; deeper |
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| surround individual neurons |
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| surround axon groups to form fascicles |
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