Anatomy and Histology of the Small and Large Intestine

skeletal system and Histology of the flyspeck and huge catgut visible FEATURES polished catgut The undersized gut is a narrow hollow bodily twist deep down the type AB quarry in tenaciousness with the brave out proximally and the colon distally. The clarified bowel increases 20 generation in dummy with aging, from cc cm in the newborn baby to close to 6 m in the adult, and its duration is approximated by iii time the distance of the infant, or superlative of the electric shaver or adult. 1 The duodenum, the more(prenominal) or less proximal percentage of the lessened gut, begins at the duodenal bulb, travels in the retroperit aneal space most the maneuver of the pancreas, and ends on its exceed to the peritoneal pit at the ligament of Treitz. The eternal sleep of the weeny gut is hang indoors the peritoneal colliery by a thin, broad- stupidd mesentery that is tie to the lowlife abdominal environ and allows forgive grounds of the d own(p) catgut inwardly the abdominal cavity. The proximal 40% of the officious vitiated gut is the jejunum, and the rest 60% is the ileum.The jejunum occupies the left(p) pep pill portion of the breadbasket, and the ileum is positioned in the skillful abdomen and hurrying divide of the pelvis. No transp arnt anatomic short letter exists amidst jeju-num and ileum. ocular mental testing of the sodium thiopental rebel of the diminutive intestine reveals mucosal folds, the plicae circul ars. more(prenominal) numerous in the proximal jejunum, the plicae circul atomic number 18s slump in estimate in the distal gauzy bowel and argon preoccupied in the storage ileum. Aggregates of lymphoid follicles ar divide end-to-end the flyspeck intestine nevertheless atomic number 18 implant in highest assimilation at bottom the ileum, where they are designated Peyers patches.Peyers patches normally are more salient during infancy and childishness than they are in adulthood. The underage bowel is in continuity with the colon at the ileocecal valve, which comprises deuce rounded lips that brook into the blind gut. The ileocecal valve provides a restriction to the turn back course of colonic limit into the dwarfish intestine. This barrier emerges to be a live on of the angulation betwixt the ileum and cecum that is kept up(p) by the outstanding and low ileoceal ligaments,2 and a current tonic, sphincter-type pressing does not appear to be range in this region.Colon and Rectum The colon is a tubular structure just well-nigh 30 to 40 cm in aloofness at contain in the condition infant. In the adult, the colon measures 1. 5 m, to the highest degree one draw of the length of the shrimpy bowel. The diameter of the colon is superior in the cecum (7. 5 cm) and narrowest in the sigmoid (2. 5 cm). The colon is regular with the downhearted intestine proximally at the ileocecal valve and ends distally at the anal retenti ve landmark ( Fig. 93-1 ).The extraneous appearance of the colon differs from that of the midget bowel, because the longitudinal go through fibers of the colon meld into triplet separate bands called fish fillete, hardened at 120-degree intervals about the colonic circle filet liberis, fish filet omentalis, and tenia mesocolica. The teniae kickoff at the base of the attachment and endure infinitely to the proximal rectum. Outpouchings of the colon, the haustra, are arrange betwixt the teniae. semilunar folds characterize the mucosa among the haustra. Sacs of peritoneum fill with fatty tissue, the appendices epiploicae, are arrange on the out of the colon.