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Apical surface
top or free surface of the epithelium

Basal surface
bottom surface of the epithelium

Basement membrane
thin layer that anchors epithelium to underlying tissue

Avascular
no blood supply

Simple
one layer

Stratified
2+ layers

Squamous
flat and thin, "squished"

Cuboidal
cube shaped

Columnar
tall rectangular- taller than wide

pseudostratified
looks like 2 or more layers, but all cells touch basement membrane so there is only one layer

Goblet cell
cells that produce and secrete mucous

Cilia
tiny hair like structures that move substances across cell surface

Lumen
open space inside a hollow organ or tube where substances can pass through

Simple epithelium
one layer of cells

Simple squamous epithelium
one layer of flat cells

Simple cuboidal epithelium
one layer of cube shaped cells

Simple columnar epithelium
one layer of tall rectangular cells

Pseudostratified ciliated columnar epithelium
looks like it has multiple layers, but all cells touch basement membrane (so truly only one layer)

Stratified epithelium
2 or more layers of cells

Stratified squamous epithelium
2 or more layers of flat cells

Transitional epithelium or Urothelium epithelium
stratified epithelium that can stretch and change shape- only found in the urinary systems within humans
