所屬欄目:組織學(xué)與胚胎學(xué)
Epithelialtissuesarecomposedofcloselyaggregatedpolyhedralcellswithverylittleextracellularsubstance.Animportantfeatureofepitheliaistheirpolarity:theyhaveafreesurfaceandabasalsurfacethatrestonthebasalmembrane.Sincebloodvesselsdonotnormallypenetrateanepithel ......(本文共 1229 字 ) [閱讀本文] >>