甲状颈干

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；

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 ;

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。

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 .

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）。

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 ) .

仅有少数起自甲状颈干、锁骨下动脉第三段和腋动脉第一段。

Only a few from tends to dry , neck subclavian artery the third paragraph and axillary artery the first paragraph .