HistologyIntroduction YuXiangmin( 于向民)DepartmentofHistologyandEmbryology1 .Definition:A science: study normal micro-structure( 微细结构)& its related function of human body.4 structural levels:Cell:thesmalleststructural&functionalunit.Tissue( 组织):groups ofcells(similarinmorphologyorrelatedinfunction) intercellular materials4typesoffundamentaltissueepithelium 上皮组织connectivetissue 结缔组织musculartissue 肌组织nervoustissue 神经组织2 . Organs: 器官organizationsofvariouskindsoftissuesinparticularways&performaspecifi