甲状腺下动脉(inferior thyroid artery):为锁骨下动脉的甲状颈干的分支，沿前斜角肌内侧缘上行到第6颈椎水平，再弓形弯向内下，经颈动脉鞘深面至甲状腺侧叶后面，分为数支入甲状腺，供应其下1/3部。该动脉在甲状腺侧叶下极的后方与喉返神经相交叉。
环咽侧三角下缘RLN与甲状腺下动脉(inferior thyroid artery，ITA)分支的关系为：66％(63／96)RLN位于ITA前方，27％(32／96)位于ITA后方。
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... 甲状腺上动脉 Superior thyroid a. 甲状腺下动脉 Inferior thyroid a. 甲状腺最下动脉 Arteria thyroidea ima ...
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... arteria thyroidea ima 甲状腺最下动脉 arteria thyroidea inferior 甲状腺下动脉 arteria thyroidea superior 甲状腺上动脉 ...
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颈下部则熟悉喉返神经与甲状腺下动脉的关系。
We must know the relation about the recurrent laryngeal nerve and the inferior thyroid artery.
结论甲状腺手术识别喉返神经的五种解剖标志中，以甲状软骨下角尖(或环甲关节)和甲状腺悬韧带较可靠，其次为甲状腺下极、甲状腺下动脉和气管食管沟。
Conclusion the inferior horn of thyroid cartilage and the suspensory ligament of thyroid gland are most reliable as the anatomical landmarks for recognizing the recurrent laryngeal nerve.
结果1。从介入治疗的角度得到了甲状腺上、下动脉起点位置及方位，非腺体支与腺体血管内径、长度、角度等的解剖及影像统计学资料。
Results 1. The anatomical and imaging data of the location, direction, inner diameters, length and angles of thyroid arteries were gained for the sake of interventional therapy.
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