Ileum
Updates to Article Attributes
Body
was changed:
The ileum is the final part of the small intestine, following the duodenum and jejunum.
Terminology
The ileum is not to be confused with the ilium.
Gross anatomy
The ileum is 2-4 m in length and is separated from the caecum by the ileocaecal valve (ICV). While there is no discrete line demarcating the jejunum from the ileum, there are few differences between the two:
- ileal mesentery contains more fat than jejunal mesentery
- ileum tends to be smaller calibre than jejunum
- ileum tends to be lighter in colour than the jejunum
- ileum contains abundant Peyer's patches
- Peyer's patches contained in the ileum are unencapsulated lymphoid nodules that contain large amounts of lymphocytes and other cells of the immune system
Blood Supply
- arterial: ileal branches of the superior mesenteric artery
- venous: correspond to arteries and drain into the superior mesenteric vein
Lymphatics
- drain to superior mesenteric lymph nodes
Innervation
-
via superior mesenteric plexus
- sympathetic supply from lateral horn cells of the T9-T10 spinal cord
- parasympathetic supply from vagus nerves
Variant anatomy
Related pathology
-<p>The <strong>ileum</strong> is the final part of the <a href="/articles/small-bowel">small intestine</a>, following the <a href="/articles/duodenum">duodenum</a> and <a href="/articles/jejunum_(textbook)">jejunum</a>.</p><h4>Terminology</h4><p>The ileum is not to be confused with the <a title="Ilium" href="/articles/ilium">ilium</a>.</p><h4>Gross anatomy</h4><p>The ileum is 2-4 m in length and is separated from the <a href="/articles/caecum">caecum</a> by the <a href="/articles/ileocecal-valve">ileocaecal valve</a> (ICV). While there is no discrete line demarcating the jejunum from the ileum, there are few differences between the two:</p><ul>- +<p>The <strong>ileum</strong> is the final part of the <a href="/articles/small-bowel">small intestine</a>, following the <a href="/articles/duodenum">duodenum</a> and <a title="Jejunum" href="/articles/jejunum">jejunum</a>.</p><h4>Terminology</h4><p>The ileum is not to be confused with the <a href="/articles/ilium">ilium</a>.</p><h4>Gross anatomy</h4><p>The ileum is 2-4 m in length and is separated from the <a href="/articles/caecum">caecum</a> by the <a href="/articles/ileocecal-valve">ileocaecal valve</a> (ICV). While there is no discrete line demarcating the jejunum from the ileum, there are few differences between the two:</p><ul>
-</ul><h4>Variant anatomy</h4><ul><li><a href="/articles/meckel-diverticulum-1">Meckel diverticulum</a></li></ul><h4>Related pathology</h4><ul><li><a href="/articles/ileal-atresia">ileal atresia</a></li></ul>- +</ul><h4>Blood Supply</h4><ul>
- +<li>arterial: ileal branches of the <a title="Superior mesenteric artery" href="/articles/superior-mesenteric-artery">superior mesenteric artery</a>
- +</li>
- +<li>venous: correspond to arteries and drain into the <a title="Superior mesenteric vein" href="/articles/superior-mesenteric-vein">superior mesenteric vein</a>
- +</li>
- +</ul><h4>Lymphatics</h4><ul><li>drain to superior mesenteric lymph nodes</li></ul><h4>Innervation</h4><ul><li>via superior mesenteric plexus<ul>
- +<li>sympathetic supply from lateral horn cells of the T9-T10 spinal cord</li>
- +<li>parasympathetic supply from vagus nerves</li>
- +</ul>
- +</li></ul><h4>Variant anatomy</h4><ul><li><a href="/articles/meckel-diverticulum-1">Meckel diverticulum</a></li></ul><h4>Related pathology</h4><ul><li><a href="/articles/ileal-atresia">ileal atresia</a></li></ul>
References changed:
- 3. Chummy S. Sinnatamby. Last's Anatomy. (2011) ISBN: 9780702033940 - <a href="http://books.google.com/books?vid=ISBN9780702033940">Google Books</a>
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