Lumen (anatomy)

• 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
• 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

• thylakoid, endoplasmic reticulum, Golgi apparatus, lysosome, mitochondrion, or microtubule

  Transluminal procedures

• 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