thyrocervical trunk

The origin of the vertebral artery, the thyrocervical trunk and the internal mammary artery ( except 1 case) is very constant, arising from the first ( or medial part) of the subclavian artery;

椎动脉、甲状颈干及胸廓内动脉（1例除外）均由锁骨下动脉之第一段发出；

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Thyrocervical artery had similar caliber to vertebral artery so that end to end anastomosis could be carried out between them, but only 38.5% of this artery had adequate artery trunk ( more than 10 mm).

甲状颈干的外径与椎动脉相似，适合端端吻合，但仅有38.5%具有合适的血管干（大于10mm）。

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Two hours later, dissect the specimen and observe the branch of the thyrocervical trunk and the branches, starting positions, pathway, and the diameters of the transverse cervical artery and the supraclavicular artery, and also observe the concomitant vein.

2小时后，解剖和观察甲状颈干的分支情况及颈横动脉和锁骨上动脉的分支情况、起始位置、行程和管径，观察其伴行静脉情况。

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