...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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By inserting electrodes into one or more of the Chambers of the heart, via a large vein, it is possible to mimic its function by applying small electrical shocks at regular intervals.
把电极通入一个或多个心房或心室，并使导入一条大静脉，就可以通过有规律的小幅电击模拟窦房结发挥作用。
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。
Participants: heads of large nursing departments of the country and the top specialized vein nurses at home and abroad.
对象：全国各大护理部主任，国内外顶尖静脉专科护士。
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