an enveloping or covering membrane or layer of body tissue 同义词：tunic, tunica,
例句与用法
1.
A false aneurysm is the term applied when only the adventitia is present . 假性动脉瘤一词用于只有一层动脉外膜的动脉瘤。
2.
Inadequate cell nutrition around vessels causes degeneration of tunica adventitia . 血管周围细胞的营养不足，引起外膜的变性。
3.
Cases report of a new procedure preventing stoma site fistula by using parietal pleura to replace esophageal adventitia layer 用胸膜壁层代替食管外膜层预防吻合口瘘315例报告315
4.
The wall of digestive tube was composed of mucous membrane , thin submucosa , tunica muscularis and tunica adventitia , but duodenal gland in duodenum was not found 消化壁一般分为4层，由内向外为粘膜、粘膜下层、肌层和外膜，其中粘膜下层很薄，十二指肠粘膜下层无十二指肠腺。
5.
The agt mrna hybridization signals were localized dispersively in the myocytes of left ventricle . while in the arterial wall , the intense signals were not restricted to the media . they were also found in adventitia and even in perivascular fat cells 原位杂交定位研究也进一步确认了agtinrna在心血管组织的表达：在左室心肌其弥散分布于心肌细胞；在血管壁不仅平滑肌层有较强的杂交信号，在外膜甚至周围脂肪细胞也有表达。
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