Purpose ependyma is lined in lumen surface of brain ' s ventricles which is composed of single ciliated cuboidal epithelium and a major component of brain csf barrier ( bcb ) and blood csf barrier ( blcb ) . it plays an important role in production of csf , signal traiisttiission , maintainance of homeostasis within the brain , and so on , and a focus of developing pathway both for administration of some drugs into the brain and treatment of brain ' s diseases . ependyma may be specified in some sites perhaps owing to functional need and modified its structures of cells and tissue , which has been called circumventricular organs ( cvos ) since 50 of 20 century 目的室管膜是衬覆在脑室内面的单层纤毛立方上皮，是脑-脑脊液屏障，血-脑脊液屏障的主要组成部分，在脑脊液的产生，脑内信息的转导，维护脑的微环境等方面具有重要的作用，也是脑内给药和脑疾病治疗新途径开发关注的焦点之一；室管膜在一些部位可能是由于功能的需要其细胞和组织结构发生了特化，在二十世纪五十年代人们将这些特化的室管膜称为室周器官。
