心内膜(英语:endocardium)是覆盖于心腔表面的光滑薄膜,即心壁的最内层,由内皮内皮下层构成。心内膜的内皮与大血管内皮相连续,心内膜的内皮下层则以结缔组织为主,位于基膜外。心瓣膜则由心内膜折叠并夹一层致密结缔组织而构成[1][2]

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心内膜细胞胚胎学生物学观点上与血管内皮细胞极为相似,心内膜还为瓣膜和心腔提供保护[3]

心内膜和心内膜下组织学,后者内有浦肯野纤维

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