The origin of the vertebral artery, the thyrocervical trunk and the internal mammary artery is very constant.

椎动脉，颈干和乳内动脉的起源非常恒定。

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The origin of the vertebral artery, the thyrocervical trunk and the internal mammary artery is very constant.

椎动脉，颈干和乳内动脉的起源非常恒定。

youdao