PSEUDOSTRATIFIED CILIATED COLUMNAR EPITHELIUM Meaning and
Definition
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Pseudostratified ciliated columnar epithelium is a type of tissue found in the lining of various organs and passageways in the body. It is characterized by column-shaped cells that appear to be arranged in multiple layers, giving the tissue a "pseudostratified" appearance. However, in reality, all the cells of this epithelium are attached to the basement membrane, a thin layer of connective tissue, and are not truly stratified.
This type of epithelium is called "ciliated" because it contains hair-like structures called cilia on the surface of the cells. These cilia extend from the apical surface of the cells and can move in coordinated waves. The coordinated movement of cilia helps in the movement of substances across the cell layer.
Pseudostratified ciliated columnar epithelium is commonly found in the respiratory system, specifically in the lining of the trachea (windpipe), bronchi, and larger bronchioles. Its function in this context is to trap and remove foreign particles, such as dust, from the air we inhale. The cilia on the surface of the cells sweep mucus and trapped particles upwards towards the throat, where they can be either expelled or swallowed.
In addition to the respiratory system, this type of epithelium is also found in the male reproductive tract, where it plays a role in moving sperm cells. The pseudostratified ciliated columnar epithelium in this context helps to transport sperm from the epididymis to the vas deferens.
