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Cross section of the gut. The lumen is the space in the middle.

In biology, a lumen (from Latin lumen, meaning "an opening"; plural lumina) is the inside space of a tubular structure, such as an artery or intestine.[1] By extension, the term lumen is also used to describe the inside space of a cellular component or structure, such as the endoplasmic reticulum.

Transluminal proceduresEdit

Transluminal procedures are procedures occurring through lumina, including:

See alsoEdit


  1. ^ Stedman's Medical Dictionary, 24th ed.
  2. ^ Adds, John; Erica Larkcom; Ruth Miller. Exchange and transport, energy and ecosystems. Nelson Advanced science (Nelson Thornes web site). p. 16. ISBN 0-7487-7487-4.  External link in |publisher= (help)