Chapter 2 Epithelium
Chapter 2 Epithelium
1. General feature. 1)contain more cells and less extracellular ground substance 2)Polarisation: --free outer surface: face air or other things basal surface: face underlying CT, have basement membrane 3) Avascularity, but innervation: -m-no blood vessels --rich in nerve terminals 4) Having functions of protection, secretion, absorption excretion and sensory reception
1.General feature: 1) contain more cells and less extracellular ground substance 2) Polarisaton: ---free outer surface: face air or other things ---basal surface: face underlying CT, havebasement membrane 3) Avascularity,but innervation: ---no blood vessels ---rich in nerve terminals 4) Having functions of protection, secretion, absorption excretion and sensory reception
2. Classification 1)Covering epithelium: the epithelium which cover body surface or line the inner surface of body cavities, tubes and sac 2)Glandular epithelium: the epithelium which main function is secretion 3) Sensory epithelium: the epithelium which has special sensory function
2.Classification 1) Covering epithelium: the epithelium which cover body surface or line the inner surface of body cavities, tubes and sac. 2) Glandular epithelium: the epithelium which main function is secretion. 3) Sensory epithelium: the epithelium which has special sensory function
3.Covering epithelium According to the number of layer and shape of cells Simple epi :---simple squamous epi ---simple cuboidal epi -m-simple columnar epi -pseudostratified ciliated columnar epi. Stratified epi ; ---stratified squamous epi -stratified columnar epl transitional epi
3.Covering epithelium: According to the number of layer and shape of cells Simple epi.: ---simple squamous epi. ---simple cuboidal epi. ---simple columnar epi. ---pseudostratified ciliated columnar epi. Stratified epi.: ---stratified squamous epi. ---stratified columnar epi. ---transitional epi
1)simple squamous epis -structural feature lone layer flattened cells, cell border are interdigitate /with flattened ellipsoid-nucleus
1) simple squamous epi: ---structural feature: /one layer flattened cells, cell border are interdigitate /with flattened ellipsoid nucleus