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| spinal cord region basic info |
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- forms the CNS with the brain
- starts from medulla and ends @ L1 and L2 vertebrae
- 31 nerves emerge from spinal cord |
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- convey info between neurons connecting the peripheral structures to the brain
- process info in some cases |
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- cervical
- thoracic
- lumbar
- sacral |
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- spinal cord is surrounded by adipose tissue, meninges, and cerebrospinal fluid
- the adipose tissue cushions the SC and is located in the epidural space
- meninges are connective tissue membrane covers and are continuous with cranial meninges |
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1) dura mater: outermost
2) arachnoid: between dura mater and pia mater
- subarachnoid: between arachnoid and pia mater. it contains CSF
3) pia mater: inner most |
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- contains sensory axons bringing info to SC
- enlargement of dorsal root is the dorsal root ganglion which contains cell bodies of sensory neurons |
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| - contain axon sending motor info to the periphery |
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| - carry motor and sensory axons of a single spinal segment |
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- begin and end within the SC
- adjacent to gray matter
- function as interneurons |
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| - cells with long axons connecting the SC with the brain |
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- bundle of axons with the same origin and a common termination
- ascending: convey sensory info from cutaneous receptors, proprioceptors, and visceral receptors
- descending: convey motor info from the brain to the effectors |
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- developmental disorder arising from failure of inferior neuropore to close
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- motor disorder, muscle hyperstiffness
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- demyelination of axons that can occur in numbeness
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- cause pressure on neurons and vascular supple to SC
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| myelopathy due to cervical spondylosis |
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- degeneration of cervical vertebrae
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- produces lower limb and lower back pain
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- accumulation of CSF in the SC
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