![Disc with nucleus pulposus and annulus fibrosus](https://veritas.widen.net/content/jnlg38hkqj/png/cervical-disc-nucleus-annulus.png?use=idsla&color=&retina=false&u=at8tiu&w=974&h=548&crop=yes&k=c)
The contrast agent used in a discogram test is injected into the inner core of the disc, called the nucleus pulposus. During the test, the needle is advanced from the back and inserted into the nucleus pulposus using the double-needle technique.
![Anterior view of the lumbar spine with the discography needle.](https://veritas.widen.net/content/rbecceq01t/png/lumbar-discography.png?use=idsla&color=&retina=false&u=at8tiu&w=974&h=548&crop=yes&k=c)
The contrast agent used in a discogram test is injected into the inner core of the disc, called the nucleus pulposus. During the test, the needle is advanced from the back and inserted into the nucleus pulposus using the double-needle technique.
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