Lumen (anatomy)

[1]In biology, a lumen (pl.

: lumina) is the inside space of a tubular structure, such as an artery or intestine.

[2] It comes from Latin lumen 'an opening'.

It can refer to: 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 are procedures occurring through lumina, including:[citation needed] This anatomy article is a stub.

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