Lumen

Lumen
A luminous term referring to the channel within a tube such as a blood vessel or to the cavity within a hollow organ such as the intestine. Lumen is a luminous term because it is Latin for light, including the light that comes through a window. When a hollow organ is cut across, you can see light through the space that has been opened. So the word "lumen" came to mean this space. For example, in arteriosclerosis, fat deposits narrow the lumen of the artery. For another example, cells called enetrocytes within the intestinal wall help transport water from the lumen of the intestine into the bloodstream.
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1. The space in the interior of a tubular structure, such as an artery or the intestine. 2. (lm) The unit of luminous flux; the luminous flux emitted in a unit solid angle of 1 steradian by a uniform point source of light having a luminous intensity of 1 candela. 3. The volume enclosed within the membranes of a mitochondrion or of the endoplasmic reticulum. 4. The bore of a catheter or hollow needle. [L. light, window]
- false l. in a dissecting aneurysm, the abnormal channel within the wall of the involved artery.
- residual l. SYN: residual cleft.
- true l. in a dissecting aneurysm, the channel representing the actual intima-lined artery.

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lu·men 'lü-mən n, pl lu·mi·na -mə-nə or lumens
1) the cavity of a tubular organ <the \lumen of a blood vessel>
2) the bore of a tube (as of a hollow needle or catheter)
3) a unit of luminous flux equal to the light emitted in a steradian by a uniform point source of one candle intensity

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n.
1. the space within a tubular or sac-like part, such as a blood vessel, the intestine, or the stomach.
2. the SI units of luminous flux, equal to the amount of light emitted per second in unit solid angle of 1 steradian by a point source of 1 candela. Symbol: lm.

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lu·men (looґmən) pl. luґmina, lumens [L. “light”] 1. the cavity or channel within a tube or tubular organ. 2. the SI unit of luminous flux; it is the light emitted in a solid angle of 1 steradian by a uniform point source with luminous intensity of 1 candela. Abbreviated lm.

Lumen of coronary artery, moderately narrowed by atheromatous plaque.


Medical dictionary. 2011.

Look at other dictionaries:

  • lumen — lumen …   Dictionnaire des rimes

  • lumen — [ lymɛn ] n. m. • 1897; mot lat. « lumière » ♦ Phys. Unité de mesure de flux lumineux (symb.lm), correspondant au flux émis dans un stéradian par une source ponctuelle uniforme située au sommet de l angle solide et ayant une intensité de 1… …   Encyclopédie Universelle

  • lumen — LÚMEN, (1) lumeni, s.m. (2) lumene, s.n. 1. s.m. Unitate de măsură a fluxului luminos. 2. s.n. Canal al unui organ anatomic cavitar (intestin, vas sangvin) sau al unor fibre textile. – Din fr. lumen. Trimis de ana zecheru, 20.05.2004. Sursa: DEX… …   Dicționar Român

  • Lumen — can mean:* Lumen (unit), the SI unit of luminous flux * Lumen (anatomy), the cavity or channel within a tubular structure * Thylakoid lumen, the inner membrane space of the chloroplast * 141 Lumen, an asteroid discovered by the French astronomer… …   Wikipedia

  • Lumen — steht für: Lumen (Einheit), die photometrische SI Einheit des Lichtstroms der innere Querschnitt von Rohren oder Röhren bzw. die lichte Weite (Innendurchmesser) einer Kanüle oder eines Katheters Lumen (Biologie), das Innere von Hohlorganen in der …   Deutsch Wikipedia

  • LUMEN — Pays d’origine  Russie Genre(s) Rock, Alternatif Années actives 1998 – Aujourd hui Label(s) …   Wikipédia en Français

  • lumen — lȗmen m DEFINICIJA 1. fiz. SI izvedena jedinica svjetlosnog toka (simbol lm), svjetlosni tok točkastog izvora intenziteta jedne kandele (cd) u prostorni kut od jednog prostornog radijana (lm = cd·sr) 2. anat. prostor unutar organa cjevasta ili… …   Hrvatski jezični portal

  • LUMEN — I (лат.) свет. Lumen naturale и lumen supranaturale см. Метафизика света. II (лат. – естественный свет ) восходящее к античной метафизике света понятие, характеризующее конечность человеческого познания. По Августину …   Философская энциклопедия

  • lumen — m. anat. Luz de un vaso o de un conducto. Medical Dictionary. 2011. lumen Unidad de flujo …   Diccionario médico

  • lumen — unit of luminosity, 1897, coined 1894 by French physicist André Eugène Blondel (1863 1938) from L. lumen light, related to lucere to shine (see LIGHT (Cf. light) (n.)) …   Etymology dictionary

  • lumen — (Del lat. lumen, luz). m. Ópt. Unidad de flujo luminoso del Sistema Internacional, que equivale al flujo luminoso emitido por una fuente puntual uniforme situada en el vértice de un ángulo sólido de un estereorradián y cuya intensidad es una… …   Diccionario de la lengua española

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