Epithelium Flashcards
General properties
Small intercellular space
On basement membrane
Avascular
Nerves pass
Origin
Ectoderm
Mesoderm
Endoderm
How nutrients enter
By diffusion through basement membrane
Stratified base layer
Columnar
Simple squamous
Flat centered nucleus
Gas exchange and viscera movement
Pluera, peritoneum, endothelium, alveoli, mesothelium
Cuboidal
Thyroid and kidney tubules
Secrete and excrete
Columnar
Basal oval nucleus
Intestine and stomach
Absorb and secrete
Ciliated columnar
Cilia on top
Uterus, fallopian tube
Psuedostratified columnar
Ciliated
Trachea, bronchi
Lubricate
Protect and transport
Non keratinised squamous layers, function
Oesophagus
Columnar-polyhedral-squamous
Kertinised squamous
Skin
Columnar-polyhedral-squamous dead- horny layer
Transitional
Urinary bladder
Columnar-polyhedral- dome shaped
2-3 layers when stretched
Glands
Exocrine(duct)
Endocrine(no duct), capillary surrounded by cells into blood(thyroid)
Unicellular gland
Goblet cell, mucus
Shapes of exocrine
Simple (tubular- alveolar) no branches
Compound (tubular- alveolar) brached
Mode of secretion of exocrine
Merocrine( mere part removed) pancrease
Apocrine( top section lost) milk
Holocrine(whole cell lost)sebaceous glands
Apical surface
Cilia hairlike processes on cell surface
Mucus/respiratory/uterus (movement)
Microvilli cytoplasmic processes surrounded by membrane and glycocalyx (S.A) Crin and myosin core
Small intestine/ kidney tubules
Stereocillia , non motile microvilli (S.A)
Epididemis, generates hearing signals
Microvilli+glycocalyx
Brush border
Lateral and basal surface
Tight junctions (prevent passage)
Desmosomes connect cells (cadherens, keratin intermediate, cytoplasmic protein plaque)
Cardiac
Hemidesmosomes attach to basement membrane
Gap junctions channels, cardiac, ions sharing, depolarisation wave, smooth muscle
Clinical 2
Metaplasia, transformation of one tissue type to another in response to injury.
Reversible if injury can be removed
Respiratory= psuedostratified»stratified squamous
Blistering
Autoantibody formation, disrupts desmosomes, affecting basement membrane in area
Proximal convoluted tubule
Simple cuboidal
Mesothelium in lung is
pleura
Transitional epithelium characteristics
Binucleated , dome shaped top layer
Intestinal glands are..
Simple tubular
Basement membrane parts
Basal lamina
Reticular lamina
Where is mesothelium
Pleura
Peritoneum
Microvilli core
Actin microfilaments
Stereocillia
Long non motile microvilli
Epididemis>increases s.a
Inner ear>generate hearing signals
