msyamp
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clear your concepts
which spinal nerves are compressed in case of disc herniations at following levels.
1.C2-C3
2.C8-T1
3.T4-T5
4.L2-L3
5.L5-S1
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| deyigunawan
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l5-s1
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| ssrpk
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(C8 and T1), there are seven cervical vertebrae, u gave the answer urself. 
1 - C3
2 - C8
3 - T4
4 - L3
5 - S1
As from lumbar segments and down below, follwowing disc herniations, the corresponding nerve segment does'nt get compressed as they leave through the upper part of their respective intervertebral foramen, therefore the nerve root for the next corresponding level gets compressed.
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| msyamp
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GOOD GOING SSRPK. THIS IS ESPECIALLY FOR LUMBAR AND LOWER.
NOW I WILL ASK ANOTHER CONCEPT
WHAT ARE THE NERVE ROOTS GOING THROUGH THESE INTERVERTEBRAL FORAMINA
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| ssrpk
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C1 to C7 nerve roots exit through the intervertebral foramen situated above their corresponding vertebrae, C8 nerve root exit from below C7 and from thoracic and downwards, all nerve roots exit through the intervertebral foramen situated below their corresponding vertebrae.
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| msyamp
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GOOD GOING SSRPK.
NOW AGAIN ONE MORE BRAIN TEASER
TELL ME THE SPINAL CORD SEGMENTS AND CORRESPONDING VERTEBREA. SORRY FOR TEASING YOU THIS MUCH. BUT I KNOW YOU CAN ANSWER THIS.
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| ssrpk
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LOL, u know it took me a while to understand wht u asked? hehe
well, there is a discrimination between the length of spinal cord and the vertebral canal, therefore spinal cord segments do not correspond numerically with the vertebra that lie at the same level.
here's a key to remember:
- cervical spine - add 1 to spinal segments
- upper thoracic - add 2 to spinal segments
- lower thoracic - add 3 to spinal segments
- 10th thoracic - L1 and L2 segments
- 11th thoracic - L3 and L4
- 12th thoracic - L5
- first lumbar - Sacral and coccygeal segments.
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| roopashri
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thanks ssrpk, i always get confused with these
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| msyamp
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see?!! I know you answer these. all the best for your exam.(wish the same for me too)
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| ssrpk
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well i already have, good luck to yourz! 
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