The cervical spinal nerve 3 (C3) is a

spinal nerve A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human body there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the ...

of the cervical segment.American Medical Association
Nervous System -- Groups of Nerves It originates from the spinal column from above the

cervical vertebra 3 In tetrapods, cervical vertebrae (singular: vertebra) are the vertebrae of the neck, immediately below the skull. Truncal vertebrae (divided into thoracic and lumbar vertebrae in mammals) lie caudal (toward the tail) of cervical vertebrae. In sau ...

(C3).

References

Spinal nerves {{neuroanatomy-stub