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| 枕下三角 (位于项区上部，由枕下肌围成,内上界为头后大直肌，外上界为头上斜肌，外下界为头下斜肌，底为寰枕后膜和寰椎后弓，浅面借致密结缔组织与头夹肌和头半棘肌相贴。枕下三角内有枕下神经和椎动脉经过) | |||
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