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In biology, a lumen (; plural lumina) is the inside space of a tubular structure, such as an artery or intestine.〔Stedman's Medical Dictionary, 24th ed.〕 By extension, the term lumen is also used to describe the inside space of a cellular component or structure, such as the endoplasmic reticulum. ==Examples of lumina== * The interior of a vessel, such as the central space in an artery or vein 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 * Within a cell, the inner membrane space of a thylakoid, endoplasmic reticulum, Golgi apparatus, lysosomes, mitochondria or microtubule. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lumen (anatomy)」の詳細全文を読む スポンサード リンク
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