Ileum
The lowest part of the small intestine, located beyond the duodenum and jejunum, just before the large intestine (the colon). Pronounced "il-eum" in the US and "eye-leum" in the UK. The word "ileum" is derived from the Greek "eileos" meaning "twisted." This is apt because, when the small intestine is viewed at surgery or at autopsy (or exposed from a wound), it looks twisted. It is also apt because, when the small intestine is obstructed, the ileum is most often the site of the twist or whatever is causing the obstruction. The ileum is not to be confused with the ilium, the upper part of the pelvis which forms the receptacle for the head of the femur at the hip joint.
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The third and longest portion of the small intestine, about 12 feet in length in humans, extending from an indistinct junction with the jejunum to the ileocecal opening. Overall, it is distinct from jejunum in being typically smaller in diameter with thinner walls, having smaller and less complex circular folds (plicae circulares), its mesentery having more fat and its arteries (ileal arteries) forming more tiers of arterial arcades with shorter vasa recta. [L. fr. G. eileo, to roll up, twist]
- i. duplex tubular or cystic segmental duplications of alimentary tract.

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il·e·um 'il-ē-əm n, pl il·ea -ē-ə the last division of the small intestine that constitutes the part between the jejunum and large intestine and in humans forms the last three fifths of the part of the small intestine beyond the end of the duodenum and that is smaller and thinner-walled than the jejunum with fewer circular folds but more numerous Peyer's patches

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n.
the lowest of the three portions of the small intestine. It runs from the jejunum to the ileocaecal valve.
ilealleac adj.

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il·e·um (ilґe-əm) [L.] [TA] the distal and longest portion of the small intestine, extending from the jejunum to the cecum. ileal adj

Medical dictionary. 2011.

Look at other dictionaries:

  • Ileum — Il e*um, n. [L. ile, ileum, ilium, pl. ilia, groin, flank.] 1. (Anat.) The last, and usually the longest, division of the small intestine; the part between the jejunum and large intestine. [Written also {ileon}, and {ilium}.] [1913 Webster] 2.… …   The Collaborative International Dictionary of English

  • ileum — (n.) lowest part of the small intestine, 1680s, medical Latin, from ileum, singular created from classical Latin plural ilia groin, flank, in classical Latin, belly, the abdomen below the ribs, poetically, entrails, guts. Sense restriction and… …   Etymology dictionary

  • ileum — ilèum (ȉleum) m DEFINICIJA anat. zadnji dio tankog crijeva, »vito crijevo« ETIMOLOGIJA srlat. ← grč. eílein: savijati …   Hrvatski jezični portal

  • Ilĕum — Ilĕum, gewundener Darm, s. Darmkanal. I. os (Ilei os), Darmbein, s.u. Beckenknochen. Ileus, Darmgicht …   Pierer's Universal-Lexikon

  • Ilĕum — (lat.), der Krummdarm, s. Darm, S. 520 …   Meyers Großes Konversations-Lexikon

  • Ileum — Ilĕum (grch.), die untere Hälfte des Dünndarms …   Kleines Konversations-Lexikon

  • Ileum — Ileum, lat., die 2. Hälfte der dünnen Gedärme; s. Darm; Ileitis, Entzündung des I.; Ileus, Schnürung des I., Krankheit (Volvulus, Miserere, Kothbrechen); Iliacum, was zum I. gehört; os iliacum Hüftbein; ilio costalis, Muskel vom Hüftbein zu den… …   Herders Conversations-Lexikon

  • ileum — ILÉUM s.n. v. ileon. Trimis de LauraGellner, 13.09.2007. Sursa: DN …   Dicționar Român

  • ileum — ► NOUN (pl. ilea) Anatomy ▪ the third portion of the small intestine, between the jejunum and the caecum. ORIGIN Latin, variant of ILIUM(Cf. ↑ilium) …   English terms dictionary

  • ileum — [il′ē əm] n. pl. ilea [il′ēə] [ModL < L, flank, groin (var. of ilium, ile): form prob. infl. by ileus (see ILEUS) < ?] the lowest part of the small intestine, opening into the large intestine: see INTESTINE …   English World dictionary

  • Ileum — Infobox Anatomy Name = Ileum Latin = Orckecme GraySubject = 248 GrayPage = 1171 Caption = Small intestine Caption2 = The cecal fossa. The ileum and cecum are drawn backward and upward. Precursor = midgut System = Artery = ileal arteries Vein =… …   Wikipedia

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