LM of a section of the human jejunum

LM of a section of the human jejunum

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Credit: MANFRED KAGE/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a section of the human jejunum, part of the small intestine. The jejunum is deeply folded & lined with finger-like project- ions, or villi, about 20 of which are seen here. Each villus has a mucous membrane, stained pink, & a core of blood & lymphatic channels. The membrane consists of columnar cells called enterocytes, which can just be seen forming the surface of each villus. The nucleus at the base of each enterocyte is dark red. The main role of enterocytes is the absorption of nutrients. Extending along the base of the villi is the muscularis mucosae, containing blue-stained smooth muscle cells. Magnification: x50 at 35mm size, x100 at 6x7cm size. Ref: MICROCOSMOS, fig. 2.1, p. 13

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Keywords: anatomy, digestion, digestive system, enterocyte, gut, human body, intestine, jejunum, light micrograph, muscularis mucosa, small intestine, villi, villus

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