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However, despite the 6 meter length, the small intestine's surface area is not adequate to absorb all body nutrients required by the body, as it is narrow in width. Thus, the small intestine features myriads of microscopic folds, which increase the surface area available for absorption. The inner walls of the small intestine (jejunum) are made up of two kinds of folds called plicae circulares and rugae. The rugae permit extra tissue for the small intestine to contract and distend when needed. The plicae circulares on the other hand are fixed structures located on the intestinal wall that again comprise two structures called villi and microvilli.

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