Striated border

Striated border is a term used in histology to describe the appearance of certain cell surfaces under the microscope. The striated border is seen in cells that have a high number of microvilli, such as the absorptive cells of the small intestine. The term "striated" refers to the appearance of the microvilli when viewed under the microscope, which resembles a series of parallel lines or "striations".

Structure and Function

The striated border is composed of a dense layer of microvilli, which are tiny, finger-like projections that extend from the surface of the cell. These microvilli greatly increase the surface area of the cell, allowing for increased absorption of nutrients and other substances. The microvilli are supported by a core of actin filaments, which are part of the cell's cytoskeleton.

In the small intestine, the striated border is particularly important for the absorption of nutrients. The microvilli contain enzymes that aid in the digestion of food, and the increased surface area allows for the efficient absorption of nutrients into the bloodstream.

Clinical Significance

Damage to the striated border can lead to malabsorption of nutrients, which can cause a variety of health problems. For example, in celiac disease, the immune system attacks the cells of the small intestine, damaging the striated border and leading to malabsorption of nutrients.

See Also

• Brush border
• Microvillus
• Cytoskeleton
• Celiac disease

References

Striated border Resources
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