Histology
The study of tissues
The tissue that forms sheets that cover body surfaces or line body cavities
Epithelial Tissue
First part of an epithelial tissues name tells you this
Number of cell layers
Epithelium has 1 layer of flattened cells and is specialized for rapid diffusion
Simple squamous epithelium
Top & bottom of an epithelial cell have different structures & functions. This characteristic is called this
Polarity
Groups of cells that are similar in structure and perform a common related function
Tissue
2 major categories of epithelial tissue
Covering & Lining epithelium & glandular epithelium
The second part of an epithelial tissue's name tells you this
Shape of cells
This epithelium has 1 layer of cube-shaped cells and is involved in absorption and secretion
Simple cuboidal epithelium
Lower surface of an epithelial cell that faces inward toward the body
basal surface
The 4 basic tissue types
Epithelial, connective, muscle and nervous tissue
Epithelium forms glands and is involved in secretion
glandular epithelium
An epithelium made up of one cell layer is called this
Simple epithelium
This epithelium consists of one layer of tall cells and can contain goblet cells microvilli or cilia
Simple columnar epithelium
An adhesive sheet attaches the basal surface of epithelial cells to the underlying cells
basal lamina
Before tissue can be examined under a microscope, it must be cut into thin slices & treated w/ something to increase contrast
Fixed, sectioned and stained
Name 4 major functions of epithelial tissue
protection, absorption, filtration & secretion
An epithelium made of 2 or more cells layers is called this
Stratified epithelium
This tissue looks multilayered b/c its cells vary in height, but it is actually only one layer
Pseudostratified columnar epithelium
Layer lies deep to the basal lamina & consists of network of collagen fibers
reticular lamina
Transmission electron microscopy (TEM) & scanning electron microscopy (SEM)
This epithelial surface is the upper, free side that faces a body surface or cavity
Apical Surface
3 terms that describe epithelial cell shapes: Flattened, cube-like, and tall
Squamous, Cuboidal and columnar
Epithelium has multiple layer w/ flattened cells at its free surface, and it major role is protection
Simple squamous epithelium
This structure is made of the basal lamina and reticular lamina and reinforces the epithelial sheet.
Basement membrane