静脉角 颈内静脉 internal venous angle jugular vein 锁骨下静脉 subclavian vein 上腔静脉 . superior Ⅴ ena cava 头臂静脉 brachiocephalic vein 17 颈内静脉internal jugular vein 锁骨下静脉 subclavian vein 上腔静脉superior vena cava 静脉角 venous angle 头臂静脉 brachiocephalic vein