第一頸神經(Cervical spinal nerve 1, C1) 是頸節脊神經的第一個分支[ 1] ,發源於寰椎 (Atlas, C1)上方,主要承載運動纖維,但也有部分負責硬腦膜 與枕骨大孔 感覺的腦膜支。此外,第一頸神經可能完全沒有背根 或背根神經節。
C1與C2 共同組成一個肌節 ,負責點頭與抬頭。
第一頸神經腹枝與其他頸神經的腹枝共同組成頸神經叢 (Cervical plexus)。
第一頸神經背枝又稱枕下神經 ,支配枕下肌群 。
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