Types of Epithelium

graph TD
  X{Epithelial cells} ==> Y{Layers};
  Y ==> y1(one layer)
  y1 ==> y1a(simple);
  Y ==> y2(multiple layers);
  y2 ==> y2a(Stratified)
  Y ==> y3(fake multiple layer);
  y3 ==> y3a(Pseudo-stratified );
  y1a ==>|squamous| y1a1[Simple squamous epithelium];
  y1a1 ==>|surrounding visceral organs | y1a1b[Mesothelium];
  y1a1 ==>|at blood vessels| y1a1a[endothelium ];
  y1a ==>|Cuboidal| y1b[Simple Cuboidal epithelium];
  y1b ==> y1b1[at sites of transport ];
  y1a ==> |Columnar| y1c[Simple columnar epithelium];
  y1c ==> y1c1[at sites of maximum with villi eg: stomach];
  y2a ==>|squamous| y2a1[Stratified squamous epithelium];
  y2a1 ==>y2a1b[at sites of physical wear and tear ];
  y2a1b ==> y2a1a[skin,vagina, esophagus];
  y2a ==>|Cuboidal| y2b1[Stratified Cuboidal Epithelium];
  y2b1 ==>y2b1a[lining ducts like cobble stone ];
  y3a ==>|columnar| y3a1[Pseudo-stratified columnar]
  y3a1 ==>|Can undergoes relax and stretch | y3a1a[Lining Bladder and Ureter ];