Biology:Lumen (anatomy)

From HandWiki
Short description: Cavity within an organ
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 (plural lumina) is the inside space of a tubular structure, such as an artery or intestine.[1] It comes from la lumen 'an opening'.

It can refer to:

  • The interior of a vessel, such as the central space in an artery, vein or capillary through which blood flows.
  • The interior of the gastrointestinal tract[2]
  • The pathways of the bronchi in the lungs
  • The interior of renal tubules and urinary collecting ducts
  • The pathways of the female genital tract, starting with a single pathway of the vagina, splitting up in two lumina in the uterus, both of which continue through the fallopian tubes

In cell biology, a lumen is a membrane-defined space that is found inside several organelles, cellular components, or structures:

Transluminal procedures

Transluminal procedures are procedures occurring through lumina, including:[3]

See also

  • Foramen, any anatomical opening
  • Thylakoid lumen


  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. 
  3. Makar, A. B.; McMartin, K. E.; Palese, M.; Tephly, T. R. (June 1975). "Formate assay in body fluids: application in methanol poisoning". Biochemical Medicine 13 (2): 117–126. doi:10.1016/0006-2944(75)90147-7. ISSN 0006-2944. PMID 1.