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4 tissue types ECM
connective muscular epithelial nervous all tissues have cells and ECM which is ground substance and fibers
epithelial tissue characteristics
mainly cells not ECM tightly packed avascular basement membrane attachment polarity makes continuous layers
epithelial polarity
apical or basal basement membrane connective tissue
cell junctions
tight adhering desmosomes hemidesmosome gap
tight
blocks passage between cells
adhering
holds cells together
desmosomes
very strong spot attachment
hemidesmosome
connects cell and basement membrane
gap
allows ions or communication

no
simple squamous

no
simple cuboidal

no
simple columnar

no
pseudostratified
basement membrane is made of
basal lamina and reticular lamina
basal lamina
made from epithelial cells
reticular lamina
made from connective tissue cells
body direction
anterior posterior medial lateral superior inferior proximal distal superficial deep