epithelial cells Flashcards
general epithelial characteristics
avascular
nutrients provided from connective tissue
polarised (difference between apical and basal end)
where is epithelium derived from
embroyo
ectoderm
endoderm
mesoderm
functions of epithelia
protection
absorption
secretion
filtration
classifications of epithelium - cell layers
simple
stratified
classifications of epithelium - shape
cuboidal
columnar
squamous
classifications of epithelium - cell modifictiosn
cilia
microvilli
kertinaised
classifications of epithelium - other cells present
goblet cells
epithelia in oral mucosa
stratified squamous epithelia
layers in stratified squamous epithelium
superficial
granular
spinous
basal
superficial layer
towards the outside
consists of dead keratin cells
granular
keratohyalin
membrane coating granules
provides water proofing
spinous
differentaiting cells
junctions keep cells packed together
basal
single alter
divides to replace dead cells from superficial layer
attatched to CT
why are some epithelium keratinised and some not
protection - high abrasion
non keratiesed- layer of dead cells with less keratin, needs to be flexible
which layer is the biggest layer in stratified squamous epithelium
spinous
linkage of stratified squamous epithelium
desmosomes
hemidesmosomes
what separates CT and epitheliym
basement membrane
what is the basement membrane
basal lamina +lamina reticularis
gland types
exocrine
endocrine
how are glands formed
proliferation of epithelial cells pushed into the underlying CT
what are used to form secretory ducts in glands
simple cuboid
what is found in alveoli membrane
simple squamous
