Anatomy

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Author:
corn
ID:
32457
Filename:
Anatomy
Updated:
2010-09-02 16:37:21
Tags:
Epithelial
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Description:
Types of Epithelium
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  1. is a sheet of cells that covers a body surface or lines a body cavity.
    epithelium
  2. forms the outer layer of skin, dips into and lines the open cavities of the cardiovascular , digestive, and respitory systems, and covers the walls and organs of the closed ventral body cavity.
    covering and lining epithelium
  3. fashions the glands of the body
    glandular epithelium
  4. What are the six functions of the epithelium
    • protection
    • absorption
    • filtration
    • excretion
    • secretion
    • sensory receptors
  5. what are the special characteristics of epithelium
    • cellularity
    • specialized contacts
    • polarity
    • supported by connective tissue
    • avascular but innervated
    • regeneration
  6. are composed of a single cell layer. typically found where absorption and filtration occur and a thin epithelial barrier is desirable
    simple epithelia
  7. consisting of two or more cell layers stacked together. are common in high abrasion areas where protection is important , such as the skin surface and the lining of the mouth
    stratified epithelia
  8. are flattened laterally and their cytoplasm is sparse. Found where the filtration or the exchange of substances by rapid diffusion is a priority.
    simple squamous
  9. provides a slick friction reducing lining in the lymphatic vessels and in all hollow organs of the cardiovascular system
    endothelium
  10. found in the serous membrane lining the ventral body cavity and covering the organs
    mesothelium
  11. consists of a single layer of cells as tall as they are wide . The spherical nuclei stain causes the cell layer to look like a string of beads. Its important function is absorption and secretion
    simple cuboidal
  12. single layer of tall closely packed cells. It lines the digestive tract form the stomach through the rectum. Mostly associated with absorption and secretion.
    simple columnar
  13. that secrete a protective lubricating mucus
    goblet cells
  14. Single layer of cells of differing heights..the cells rest on the basement membrane. It also secretes particularly of the mucus, and also absorbs.
    pseudostratified columnar
  15. Contains two or more cell layers. They regenerate from below. The basal cells divide and push apically to replace the older surface cells. Considered more durable than the simple epithelia. The major role is protection
    stratified epithelia
  16. is the most widespread of the epithelia. composed of several layers , it is thick and well suited for its protective role in the body. Found in areas subject to wear and tear and its surface cells are constantly being rubbed away and replaced by division of basal cells. Forms the external part of the skin and extends a short body distance into every body opening
    stratified squamous
  17. rare in the body, mostly found in the ducts of some of the larger glands ( sweat and mammary glands).
    stratified cuboidal epithelium
  18. also has a limited distribution in the body. Small amounts are found in the pharynx, the male urethra, and some lining of the glandular ducts. ALso occurs at transitio areas between two other types of epithelium
    stratified columnar
  19. forms the lining of hollow urinary organs, which stretch as they fill with urine. Cells at the basal level are cuboidal or columnar.
    transitional

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