Ependymacle llsp rovidea unicellulaerp ithelialiln ingfo r brainv entriclesa ndc entracl analo f the spinacl ord( Berrye t al., 1995)E. mbryologically, e pendymacle llsd ifferentiaftreo mt he neuroepithelciaell ls,a ftert he latterc easet o producen euroblasatsn dg liablast(sS adferf, 9 85). Therei s a markedr egionavl ariationin the ependymaliln ingo f the brainv entricleisn mammalslt. wasr eportetdh att hee pendymacle llso verlyinga reaso f greym attear rec uboidainl shapea nde achc ellp resentns umerousc iliai n its apicafc entres, urroundebdy shortm icrovillHi. owever,wheret hee pendymlain esw hitem attert,h ec ellsa rem arkedlfyla tteneudpto the extento f beings quamouas ndf ewero f thema rec iliated($ cott et
al.,1 974;P agee t al.,1 979M; estrese t at.,1 985M; itroe t al.,1 989A; lvarez- Morujoe t al,,1 992)M. oreovetrh, e ependymoaf thev entriculacrh oroid plexusesw as noticedto be a low cuboidael pitheliumw ith numerous microvilbliu tf ewc iliao n the surfacea, ndi ts underlyinsgt romaw asr ichi n fenestratecda pillarie(sC fementai nd lVlarin1i,9 721.