. Cunningham's Text-book of anatomy. Anatomy. THE ABDOMINAL VISCEEA. 1421 in contact with the anterior abdominal wall immediately above the lateral half of the inguinal ligament. In the normal condition it is completely surrounded by peritoneum, and can, therefore, along with the vermiform process, be readily delivered out of the abdomen. In chronic constipation, associated with intestinal atony, the caecum is thin-walled, dilated, abnormally movable, and often prolapses into the pelvis. The position of the ileo-caecal valve corresponds, on the surface of the body, to the medial angle between
. Cunningham's Text-book of anatomy. Anatomy. THE ABDOMINAL VISCEEA. 1421 in contact with the anterior abdominal wall immediately above the lateral half of the inguinal ligament. In the normal condition it is completely surrounded by peritoneum, and can, therefore, along with the vermiform process, be readily delivered out of the abdomen. In chronic constipation, associated with intestinal atony, the caecum is thin-walled, dilated, abnormally movable, and often prolapses into the pelvis. The position of the ileo-caecal valve corresponds, on the surface of the body, to the medial angle between the intertubercular and right lateral lines, while the orifice of the vermiform process is one inch lower. It is to be noted that the lower end of the ileum protrudes somewhat into the caecum, and that its circular muscular fibres are prolonged into the flaps of the colic valve. Both of these anatomical arrangements favour the occurrence of intussusception. In infants, other predisposing causes are: (1) the relatively rapid enlargement of the lumen of the large intestine as compared with the small; (2) the greater mobility of the caecum; and (3) the frequent presence of a mesentery to the ascending colon. Vermiform Process.—The vermiform process ( vermiform appendix), which springs from the postero-medial aspect of the caecum, one inch below the ileo-caecal junction, is provided with a well-developed " meso-enteriole " derived from the posterior aspect of the lowest part of the iliac mesentery. It is this portion of the posterior layer of the mesentery which sometimes develops a band-like thickening, which, by dragging upon the inferior end of the ileum, produces the kink to which attention has been directed by Arbuthnot Lane. The artery of the vermiform process is the only vessel which supplies the process; it occupies the free border of the meso-enteriole and gives off several branches which pass between its two layers to reach the organ. In amputating the ver
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
