9 Colon Diseases
• Cecum has the largest diameter: with obstruction, this is the most likely location for a perforation (greatest increase in pressure, per Laplace’s law).
• Colon externally distinguished by omental (epiploic) appendices, haustra (sacculations), and taeniae coli (triple bands of longitudinal smooth muscle)
Outer longitudinal layer reduced to 3 bands: taeniae coli
• From the cecum to the splenic flexure of the transverse colon, the colon was derived from the caudal midgut and is supplied by the superior mesenteric artery and vagus.
• Preganglionic fibers
• Preganglionic fibers distributed via splanchnic nerves to superior and inferior mesenteric plexuses
• Segmental visceral afferents for ascending and transverse colon travel parallel to sympathetics through the superior mesenteric plexuses and splanchnic nerves.
• Superior mesenteric artery branches
• Inferior mesenteric artery branches
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