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layers that comprise the spinal meningies
dura mater,subdural layer,arachnoid mater(thin delecate),subarachnoid space, pia mater
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what protects the spinal cord
vertebrae,meningies,epideral spac(between the vertebra and dura mater)
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how many segments does the spinal cord contain?
31
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how far into the vertebral column does the spinal cord extend
L3/L4 L4/L5
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whats the purpose of the filum terminale?
spinal cord 2 coccyx
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how many pairs of spinal nerves are there
31 pairs
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why does the cervical and lumbar enlargments exsist
more nerve fibers and cross section anatomy
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how is grey matter arranged in spinal cord
towards the center, arranged into horns(anterior lateral and posterior)
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how is white matter arranged in spinal cord
- towards outside
- -arranged into columns(also called funiculus)
- (anterior,posterior,lateral)
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whats the purpose of sensory and motor nuclei that r within the gray matter?
sensory nuclei 1) somatic -tactile sensations 2)visceral-info from organ systems INFO RECEPTORS -> BRAIN
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what is the purpse of sensory and motor nuclei that r within white matter?
- motor nuclei visceral-motor commands to organ system
- somatic-motor command skeletal system BRAIN-> EFFECTOR
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what types of neurons go thru dorsal root?
sensory neurons merge to form spinal cord with dorsal root
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types of neurons thru ventricle root
carries motor neurons form spinal cord with dorsal root
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dorsal root and ventricle root merge to form what?"
dorsal root ganglion
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what does the dorsal root ganglion contain?
contains cell body of the unipolar sensory neurons
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why is there a dorsal root ganglion but not a ventricle root ganglion?
motor neurons r multi polar. cellbody is in grey matter
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what is the arrangment of anterior,posterior,and lateral white columns?
- posterior collects from skin and muscles from back receptor-> dorsal ramus-> dorsal root-> spinal dorsal
- ventral ramus sensory info from limbs and ventricle body wall -> receptor->ventral ramus-> dorsal root->spinal cord
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what info is carried in the ascending tracts and descending tracts?
ascending is sensory info and descending motor commands
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difference between faciculus and fasciculus
faciculus is a bundle of nerve fibers and fasciculus a bundle of muscle fibers
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