...9mm，内膜薄，内弹性膜不发达或不明显。中膜比其相伴行的中动脉薄得多,环形平滑肌分布稀疏.外膜一般比中膜厚，没有外弹性膜，由结缔组织组成，有的中静脉外膜可有纵行平滑肌束。 4.大静脉 大静脉(large vein)管径在10mm以上，上腔静脉、下腔静脉、无名静脉和颈静脉等都属于此类。
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large cross vein [昆] 大横脉
large cerebral vein 大脑大静脉
large concealed vein 大隐静脉
unconformable vein super-large uranium deposit 不整合超大型铀矿床
·2,447,543篇论文数据，部分数据来源于NoteExpress
A closer view of a thromboembolus filling a main pulmonary artery reveals a layered appearance, typical of a thrombus that formed in a large vein of the pelvis or lower extremity.
肺动脉主干内的血栓栓子近距离外观显示分层结构，这是骨盆或下肢大静脉血栓的特征表现。
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Idaho also boasts a large vein deposit of thorium and rare earth metals.
FORBES: Is Thorium the Biggest Energy Breakthrough Since Fire? Possibly.
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