The lumen , Pl. Lumina ( Latin lumen , light ' ,' window ') referred to in the anatomy , medicine and medical technology the inner cavity of hollow organs and tubular bodies, for example, the blood vessels , the stomach , the intestine and the bladder of mammals and in the tracheal system of insects.
In plants, lumen refers to the cavity of a guide cell ( trachea , tracheids , sieve tube ). The interior of cell organelles (e.g. the endoplasmic reticulum ) and membrane systems (e.g. thylacloids in chloroplasts) is called lumen.
Light opening is a secondary meaning of the Latin word lūmen (cf. lūx, 'light' , as well as the light measure in architecture ). The anatomical meaning of the term has only been demonstrable in scholarly language since the end of the 19th century.
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