1. It derives its fibers from the sixth, seventh, and eighth cervical nerves . 2. The cervical nerves are the spinal nerves from the cervical vertebrae. 3. Anatomic structures innervated by cervical nerves C1-C3 have the potential to cause headache pain. 4. Foraminal stenosis at this joint is the most common cause of cervical nerve root pressure. 5. In rare cases when these nerves are also affected, cervical nerve branches can be used. 6. Although there are seven cervical vertebrae ( C1-C7 ), there are eight cervical nerves C8. 7. The cervical plexus is formed from a unification of the anterior divisions of the upper four cervical nerves . 8. This is because the supraclavicular nerves have the same cervical nerves origin as the phrenic nerve, C3 and C4. 9. All cervical nerves except C8 emerge above their corresponding vertebrae, while the C8 nerve emerges below the C7 vertebra. 10. The resulting pressure on my cervical nerves made my neck ache, but while the dominoes were falling, I wasn't getting any smarter.