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In biology, a lumen (pl.: lumina) is the inside space of a tubular structure, such as an artery or intestine.cite-ref-1[1] It comes from Latin 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 tractcite-ref-2[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

• the fluid-filled cavity forming in the blastocyst during pre-implantation development called the blastocoel

In cell biology, 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

• See also

• References

Transluminal procedures are procedures occurring through lumina, including:

• natural orifice transluminal endoscopic surgery in the lumina of, for example, the stomach, vagina, bladder, or colon

• procedures through the lumina of blood vessels, such as various interventional radiology procedures:

• percutaneous transluminal angioplasty

• percutaneous transluminal commissurotomy

• Foramen, any anatomical opening

cite-note-11. ↑ Stedman's Medical Dictionary, 24th ed.

cite-note-22. ↑ citerefaddserica-larkcomruth-miller2004Adds, John; Erica Larkcom; Ruth Miller (2004). Exchange and transport, energy and ecosystems. Nelson Advanced science (Nelson Thornes). p. 16. ISBN 0-7487-7487-4.