Question about location of spinal nerve.

[YuQX]

For vertebral column, there are C1-7, T1-12, L1-5, S1-5 and Co1-4. For spinal nerves, there are 8 cervical, 12 thoracic, 5 lumbar , 5 sacral and 1 coccygeal. So, that means C8 spinal nerve should be between C8-T1. Below T1 vertebrate, the number for spinal nerve is under the same number's vertebrate. For example, herniated disk between L3-L4 should compress L3 nerve root, not L4 one, which is showed on HY Anatomy (page 4, Table 1-2).
Please help me to clarify this question.
Thank you!

[YuQX]

I found the correct answer in USMLE Road Map Neuroscience.
Anybody uses HY Anatomy need to change Table1-2 on page 4. They made a big mistake, almost confused me again.
Herniated disk between L3-L4 compresses L3 nerve root, not L4.
Herniated disk between L4-L5 compresses L4 nerve root, not L5.
Herniated disk between L5-S1 compresses L5 nerve root, not S1.

[md90]

always thought... vertebrae, nerve, vertebrae, nerve, vertebrae, nerve.. knowing that the vertebrae came before the nerve...then figured out everything else...

[YuQX]

always thought... vertebrae, nerve, vertebrae, nerve, vertebrae, nerve.. knowing that the vertebrae came before the nerve...then figured out everything else... I don't think you are totally right this time, md90.
For thoracic and lumbar nerve roots, it is vertebrate first, then nerve, but for cervical nerve roots, it is opposite. It is nerve first, then vertebrate.

[wcb22]

and the reason for this... cervical nerves are the exception. there are 8 of them, with only 7 vertebrae... so right after C8, it changes.

[md90]

You are right.. YuQX.. I went back to look at the anatomy pictures of the spinal nerves and vertebrae..the first spinal nerve of each type of vertebrae comes before the first vertebrae (should say that it's coming from the top lateral of the first vertebrae),...

thank you for making me think...:p

[YuQX]

It's good we all refresh our memory.

[md90]

found a chart that might be helpful for all of us...
http://images.google.com/imgres?imgurl=http://www.cnjc.org/images/bigspine.jpg&imgrefurl=http://www.cnjc.org/public/chiro101.html&h=1074&w=763&sz=132&hl=en&start=22&tbnid=mPJsbCdii51bYM:&tbnh=150&tbnw=106&prev=/images%3Fq%3Dspinal%2Bnerves%26svnum%3D10%26hl%3De n%26lr%3D%26rls%3DSUNA,SUNA:2006-03,SUNA:en%26sa%3DN

1. Click the above site
2. it will be the second image once the site comes up
3. double click the image to enlarge...

It tells you of the vertebrae, nerves, areas that it supplies, and the possible complications... hope that it is helpful...

[dr_rekha2005]

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[amarah2705]

im following kaplan notes it says disc herniation bet l4-l5 affects l5 nerve
because l4 nerve is spared as it passes through intervertebral foramen superior to the site of herniation.if u see the diagram u can make out
herniated disc will be below the foramen.is this right if somebody knows can just tell me

[dr_rekha2005]

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[sat_cp]

u r right amar ....

[krishnareddy]

hai rekha , in case of l4-l5 disc prolapse the nerve root that is compressed is l4.