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33 Cards in this Set

  • Front
  • Back
Where do you find epithelium?
Epithelium lines free surfaces (whether internal or external) and forms glands
True or False: epithelium is vascular
False- epithelium is in fact avascular
Name the 4 general characteristics of epithelium
Epithelium is:
1. Highly cellular
2. No direct blood supply
3. High regenerative power
4. Cell have polarity (apical, basal, and lateral surface)
How many cells are there in a layer of Simple Surface Epithelia?
Simple surface epithelia is 1 cell thick
How many cells are there in a layer of Stratified Surface Epithelia?
Stratified surface epithelia is 2 or more cells thick
How many cells are there in a layer of Pseudostratified Surface Epithelium?
Pesudostratified surface epithelium appears to be >1 cell thick but each cell actually contacts the basement membrane
What is the general rule for naming epithelium that is layered and contains cells of more than one shape?
The general rule for naming epithelium that is layered and contains cells of more than one shape: it is named for the cell shape forming the most superficial layer
Describe the shape of squamous epithelium
Squamous epithelium has flattened scale-like cells with a flattened nuclei
Describe the shape of cuboidal epithelium
Cuboidal epithelium has cells that are as tall as they are wide with round nuclei
Describe the shape of columnar epithelium
Columnar epithelium has cells taller by 2x or more than they are wide with oval nuclei parallel to long axis of cell
Describe the typical characteristics of dysplastic cells
Dysplastic cells have increased ratio of nuclear to cytoplasmic volume
Definition of endothelium
Endothelium- simple squamous epithelium that lines blood and lymphatic vessels
Definition of mesothelium
Mesothelium- simple squamous epithelium that lines major body cavities and covers the free outside surface or organs
Definition of neuroepithelium
Neuroepithelium- sheets of sensory receptors cells
Definition of germinal epithelium
Germinal Epithelium- epithelium that gives rise to spermatozoa
Definition of transitional epithelium
Transitional Epithelium- pseudostratified epithelia
Describe the appearance of bladder epithelium when the bladder is full vs. empty
When the bladder is full, the transitional epithelium appear to be stratified squamous epithelium

When the bladder is empty, the transitional epithelium appear to be pseudostratified columnar or cuboidal
What are the two component layers of the basement membrane?
The basement membrane is composed of basal lamina and reticular lamina
What composes the basal lamina and what cell produces it?
Type IV collagen and laminin produced by epithelium make up the basal lamina
What composes the reticular lamina and what cell produces it?
Type III collagen produced by fibroblasts makes up the reticular lamina
Where are the stereocilia found?
Stereocilia is found in the epididymis
Which are motile: microvilli, stereocilia, or cilia?
Microvilli and stereocilia are nonmotile, cilia are motile
What composes a junctional complex?
Zonula occludens (tight junction), zonula aherens (intermediate junction), macula adherens (desmosome) compose junctional complexes
How do junctional complexes appear under the microscope?
Junctional complexes appear as darkly staining spots or lines near the apical surfaces of adjoining epithelial cells
Example of single cell exocrine glands
Goblet cells in the epithelium of the intestine or respiratory tract are single cell exocrine
Example of muticellular exocrine glands
Salivary glands and exocrine portion of pancreas are multicellular exocrine
Function of myoepithelial cells
Myoepithelial cells are specialized for contraction, the share the basal lamina of secretory acinar cells
Description of myoepithelial cells
Myoepithelial cells exhibit sparse fibrillar cytoplasmic processes that radiate out from the cell body, wrapping around the acini
Describe serous acinus cells
Serous acinus cells:
1. Pyramidal shaped
2. Indistinct cell boundaries
3. Spherical nuclei
4. Apical secretory granules
5. Basophilic cytoplasm
6. Secretory product is proteinaceous, thin, watery, contains enzymes
7. Located in pancreas
Describe mucous acinus cells
1. Pyramidal cells
2. Distinct cell boundary
3. Flattened nucleus at the base of the cell
4. Slight basophilia
5. Secretory product is viscous
6. Located in salivary gland
Definition of merocrine secretion
Merocrine secretion- proteinaceous secretions released via secretory granules (ex. eccrine and apocrine sweat glands, a misnomer)
Definition of apocrine secretion
Apocrine secretion- large droplets of product are released from the apical surface of the cell
Definition of holocrine secretion
Holocrine secretion- whole cell is secreted or destroyed in the process of secretion (ex. sebaceous gland)