Cross section of the gut. The lumen is the space in the middle also known as the volume.
Normal histology of the breast, with lumen annotated at bottom right

In biology, a lumen (pl.: lumina) is the inside space of a tubular structure, such as an artery or intestine.[1] It comes from Latin lumen 'an opening'.

It can refer to:

In cell biology, a lumen is a membrane-defined space that is found inside several organelles, cellular components, or structures, including thylakoid, endoplasmic reticulum, Golgi apparatus, lysosome, mitochondrion, and microtubule.

Transluminal procedures

Transluminal procedures are procedures occurring through lumina, including:[citation needed]

See also


  1. ^ Stedman's Medical Dictionary, 24th ed.
  2. ^ Adds, John; Erica Larkcom; Ruth Miller (2004). Exchange and transport, energy and ecosystems. Nelson Advanced science (Nelson Thornes). p. 16. ISBN 0-7487-7487-4.