Bowelcancer Frame

Colonic Physiology Ursula M. Szmulowicz and Tracy L. Hull The human colon is a participating pipe reed organ, touch on in a gigantic array of functions, including the absorption of water and electrolytes, the lay aside of unabsorbed nutrients, and the witch of luminal contents as feces. While not an organ essential for life, the colon still plays a major numerical function in maintaining the overall health of the human body. pinch these physiologic principles is integral to the happy treatment both medical examination and surgical of colonic disease. Embryology The embryology of the colon informs its anatomy. In the third and after part weeks of gestation, the uninitiate intestine arises from the cephalocaudal and lateral folding of the dorsal scratch of the endoderm-lined yolk sac, forming a straight tube situated posteriorly in the embryo.13 Although the mucosa originates from the endoderm of the yolk sac, the muscular wall, colligation tissue, and serosa have a mesodermal etiology. 4 By the fourth week of gestation, the intestine tube develops into three unequivocal regions: the foregut, midgut, and hindgut.4 The midgut begins immediately distal to the confluence of the ballpark bile line and the duodenum, extending to include the proximal two-thirds of the cross(prenominal) colon.

At the midgut, the primitive intestine maintains its confederation to the yolk sac via the vitelline duct; failure of the vitelline duct to extinguish finally results in a Meckels diverticulum or a vitelline cyst or fistula.2,5 The hindgut reaches from the distal third of the transverse colon to the anal ca! nal proximal to the dentate line. The midgut receives its vascular supplement from the superior(p) mesenteric artery and the hindgut from the inferior mesenteric artery.6 The colon gains its ultimate position by means of a series of rotations of the immature gut. During the 5th week of gestation, the midgut, particularly the future ileum, rapidly enlarges beyond the capacity of the abdominal cavity,...If you want to get a ripe essay, order it on our website: OrderCustomPaper.com

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