...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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His adversary had fallen senseless with excessive pain and the flow of blood, that gushed from an artery or a large vein.
他的敌手已经由于过度的疼痛，又由于从一条动脉或是一条大血管里涌出了大量的鲜血，而倒下来失去知觉了。
His adversary had fallen senseless with excessive pain and the flow of blood that gushed from an artery or a large vein.
他的敌手已经由于过度的疼痛，又由于从一条动脉或是一条大血管里涌出了大量的鲜血，而倒下来失去知觉了。
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。
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