JONATHAN ASHTON / SCIENCE PHOTO LIBRARY JONATHAN ASHTON / SCIENCE PHOTO LIBRARY
Appendix. Light micrograph of a section through the human appendix. The appendix is a short, blunt-ended tube attached to the end of the caecum, a pouch at the start of the large intestine. It is not known to have any function in humans. At centre left is the lumen space with a folded mucosal wall (purple). Around this wall is lymphoid tissue (pink and blue) which often forms follicles. This is surrounded by an outer serosa layer (pink). Magnification: x2.5 at 35mm size.
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