Histology
Body Tissues
groups of cells with similar structure and function
four primary types
epithelial tissue (epithelium)
connective tissue
muscle tissue
nervous tissue
Epithelial tissue
locations
body coverings - outer layer of skin
body linings - respiratory, digestive, reproductive and excretory tracts
ex. inner lining of all hollow visceral organs (stomach and respiratory
tubes), lining of all blood cells
glandular tissue - exocrine, endocrine
functions
protection
absorption
filtration
secretion
hallmarks
cellularity - no space between
cells, compacted
often form sheets with one free
surface — the apical surface,
Histology 1
, and an anchored surface, —
the basement membrane
avascular (no blood supply)
regenerate easily if well
nourished
epithelium depends on the supply
of blood coming from a different
tissue (connective tissue) —
support under the tissue
classification of epithelia
number of cell layers
simple — one layer
stratified — more than one
layer
shape of cells
squamous — flattened, like
fish scales
cuboidal — cube shaped,
like dice
columnar — shaped like
columns, length > width
name epithelial tissues according to number and shape (based on apical
surface)
Histology 2
, simple epithelia
simple epithelia
functions in absorption, secretion and filtration
very thin (so not suited for protection)
not in the skin
simple squamous epithelium
single layer of flat cells
Histology 3
Body Tissues
groups of cells with similar structure and function
four primary types
epithelial tissue (epithelium)
connective tissue
muscle tissue
nervous tissue
Epithelial tissue
locations
body coverings - outer layer of skin
body linings - respiratory, digestive, reproductive and excretory tracts
ex. inner lining of all hollow visceral organs (stomach and respiratory
tubes), lining of all blood cells
glandular tissue - exocrine, endocrine
functions
protection
absorption
filtration
secretion
hallmarks
cellularity - no space between
cells, compacted
often form sheets with one free
surface — the apical surface,
Histology 1
, and an anchored surface, —
the basement membrane
avascular (no blood supply)
regenerate easily if well
nourished
epithelium depends on the supply
of blood coming from a different
tissue (connective tissue) —
support under the tissue
classification of epithelia
number of cell layers
simple — one layer
stratified — more than one
layer
shape of cells
squamous — flattened, like
fish scales
cuboidal — cube shaped,
like dice
columnar — shaped like
columns, length > width
name epithelial tissues according to number and shape (based on apical
surface)
Histology 2
, simple epithelia
simple epithelia
functions in absorption, secretion and filtration
very thin (so not suited for protection)
not in the skin
simple squamous epithelium
single layer of flat cells
Histology 3
