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Lumen (anatomy)

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.

in the lumina of, for example, the stomach, vagina, bladder, or colon

natural orifice transluminal endoscopic surgery

angioplasty

Transluminal procedures are procedures occurring through lumina, including:

any anatomical opening

Foramen