Histology

The science that deals with the study of tissues

 Epithelial tissue

 functions:

protection

absorption

filtration

slippery surface

The tissue composed of cells that line the captives and surfaces of structues throughout the body

characteristic of epithelia:

cellularity

Cells that are separated by minimal extra cellular material

characteristics of epithelia

Special contacts

Adjacent epithelial cell joined by special junctions

characteristics of epithelia

Polarity

Free upper suface and a lower surface

characteristics of epithelia

Support by connective tissue

avascular : not associated with or supplied by blood vessels

innervate: to supply(an organ or body part) with nerves

characteristics of epithelia

Regeneration

Lost cells that are quickliy replaced by cell division

classification of epithelia

First name of tissue; cell layers

There is simple and then there is stratified... simple meaning one layer of cells and stratified meaning more than one layer of cells.

classification of epithelia

last name; shape of cells:

Spuamous

cells that are wider than tall (plate-like)

classification of epithelia

last name; shape of cells

Cuboidial

Cells that are as wide as tall, like cubes

classifications of epithelia

last name; shape of cell

Columnar

Cells are taller than they are wide, like columns

Glands

consist of a single cell or a group cells that secrete substance into ducts or tube, onto the surface, or into the blood

Exocrine glands

Ducts carry to epithelial surface

exocrine glands classified by structure

• simple
• copound

• simple is the unbranched duct

• copound is the branched duct

exocrine glands classified by shape

• tubular
• alveolar
• tubuloavleolar

• tubular- shaped like tubes
• alveolar- shaped like spheric sacs
• tubuloalveolar- both tubes and spheric sacs

Endocrine glands

connective tissue