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The left and right brachiocephalic veins (or innominate veins) in the upper chest are formed by the union of each corresponding internal jugular vein and subclavian vein. This is at the level of the sternoclavicular joint.〔Chitnis, Cumberbatch, Gankande. Practice Papers for MCEM Part A, Wiley-Blackwell 2010〕 The left brachiocephalic vein is usually longer than the right. These great vessels merge to form the superior vena cava posterior to the junction of the first costal cartilage with the manubrium sternum. The brachiocephalic veins are the major veins returning blood to the superior vena cava. ==Tributaries== The brachiocephalic vein is formed by the confluence of the subclavian and internal jugular veins. In addition it receives drainage from: * Left and right internal thoracic veins (Also called internal mammary veins): drain into the inferior border of their corresponding vein * Left and right inferior thyroid veins: drain into the superior aspect of their corresponding veins near the confluence * Left superior intercostal vein: drains into the left brachiocephalic vein〔Ryan, McNicholas & Eustace "Anatomy for Diagnostic Imaging: 3rd Edition"〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Brachiocephalic vein」の詳細全文を読む スポンサード リンク
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