The structure in the triangle was the vertebral artery, muscular branches, vertebral venous plexus and C1 nerve.

枕下三角内有椎动脉及肌支，椎静脉丛和颈1神经。

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And then, it can reflect the blood vessel flux of internal carotid plexus, intracranial sector and vertebral, the quantification target of vein backflow drag.

据此可反映出颈内动脉颅内段和椎动脉的血管流量以及静脉回流阻力等定量指标。

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Objective:To provide anatomical basis for the amputation of nerval root of brachial plexus at external vertebral canal.

目的：为椎管外臂丛神经根切断术提供解剖学资料。

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