. Diseases of the rectum and anus: designed for students and practitioners of medicine. n the leftwith the splenic flexure and descending colon, where it is calledthe omentum colicum. The transverse and sigmoid colons are invariably attachedto the posterior abdominal wall by mesocolons, and in 35 percent, the descending and in 25 per cent, the ascending colonshave similar attachments. The cecum, however, never hassuch a connection. The location of the different parts of the colon is variable,owing to abnormalities and the enlargement of neighboringviscera. Sometimes diverticula (Fig. 1) are fo
. Diseases of the rectum and anus: designed for students and practitioners of medicine. n the leftwith the splenic flexure and descending colon, where it is calledthe omentum colicum. The transverse and sigmoid colons are invariably attachedto the posterior abdominal wall by mesocolons, and in 35 percent, the descending and in 25 per cent, the ascending colonshave similar attachments. The cecum, however, never hassuch a connection. The location of the different parts of the colon is variable,owing to abnormalities and the enlargement of neighboringviscera. Sometimes diverticula (Fig. 1) are found, leading of¥ DISEASES OF THE RECTUM AND ANUS from the colon or rectum, and when distended with feces theymay be mistaken for tumors. SIGMOID COLON (SIGMOID FLEXURE) The close relation of the sigmoid colon and rectum, andthe frequency with which disease of one extends to the other,necessitate a full description of the anatomy of both in a workof this scope. The Sigmoid Colon (Fig. 2, S) is the irregularly (S-shaped)arranged portion of the large intestine occupying the left iliac. Fig. 2.—Showing Location of Sigmoid Colon and its Relation to the Rectum(Schematic). S, Sigmoid Colon; D, Dividing-line Between it and Rectum;B, Rectal Ampulla; A, Anus; V, Anal Canal; L, Part of Sigmoid Loop inthe Right Iliac Fossa. fossa. It begins above at the crest of the ilium, and termi-nates in the rectum at the left sacro-iliac articulation or infront of the upper edge of the sacrum. The upper portion has a peritoneal covering anteriorlyand laterally; the lower segment has a mesocolon, possessesgreater mobility and a double curve, from which the sigmoidcolon derives its name. The narrowest part of the sigmoidis at its junction with the rectum (Fig. 2, D). The longitudi-nal muscular bands (slightly developed in infants), which areprominent in the upper part of the sigmoid, become less pro-nounced and thinner in the lower part, where they finally ANATOMY AND PHYSIOLOGY 7 lose their characte
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanusdis, bookyear1910
