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The cervical spinal nerve 1 (C1) is a spinal nerve of the cervical segment. C1 is unique in that all other spinal nerves have both sensory and motor fibres, whereas C1 only carries motor fibres.
It originates from the spinal column from above the cervical vertebra 1 (C1).
Muscles innervated by this nerve are:
References
Cervical spinal nerve 1 Wikipedia(Text) CC BY-SA