PROFESSORS P.M. MOTTA & F.M. MAGLIOCCA / SCIENCE PHOTO LIBRARY PROFESSORS P.M. MOTTA & F.M. MAGLIOCCA / SCIENCE PHOTO LIBRARY
Colon surface. Coloured Scanning Electron Micro- graph (SEM) of the glandular surface of the wall (mucosa) of the human colon. At centre is a large opening or Crypt of Lieberkuhn of a tubular gland. Around it and making up the gland are two types of epithelial cells: enterocytes (pink) covered in tiny bumps (microvilli) that enhance water absorption; goblet cells that occur in the small rounded depressions seen here, and which secrete mucus. The glandular colon wall is lubricated with mucus, and functions to produce faeces by absorbing water and vitamins from the food residue. Magnification: x1,100 at 6x7cm size.
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