. Cunningham's Text-book of anatomy. Anatomy. CAECUM AND VEEMIFOKM PEOCESS. 1215 always be distinguished, and are found to bear the same relation to one another as in the dried condition, although this may be obscured by foldings or rugae. The aperture may be slit-like or rounded, with sloping or funnel-shaped edges; the frenula are not so prominent at times; but the whole valve projects much more abruptly into the cavity of the caecum than in the distended and dried specimen. Structure of the Valvula Coli.—Each labium of the valve is formed of an infolding of all the coats of the gut, except
. Cunningham's Text-book of anatomy. Anatomy. CAECUM AND VEEMIFOKM PEOCESS. 1215 always be distinguished, and are found to bear the same relation to one another as in the dried condition, although this may be obscured by foldings or rugae. The aperture may be slit-like or rounded, with sloping or funnel-shaped edges; the frenula are not so prominent at times; but the whole valve projects much more abruptly into the cavity of the caecum than in the distended and dried specimen. Structure of the Valvula Coli.—Each labium of the valve is formed of an infolding of all the coats of the gut, except the peritoneum and the longitudinal muscular fibres, and consequently consists of two layers of mucous membrane, with the sub- mucosa and the circular muscular fibres between, all of which are continuous with those of the ileum on the one hand and of the large intestine on the other. The surface of each labium turned towards the small intestine is covered with villi, and conforms in the structure of its mucous membrane to that of the ileum; whilst the mucous membrane of the opposite surface resembles the mucous coat of the large bowel. PERITONEUM. uscnanES Ileum with the Cjecum, to show the Formation of the Val- vula Coll In the dried specimen the superior labium usually projects further into the cavity of the caecum than the inferior, so that the aperture appears to be placed between the edge of the inferior segment and the inferior surface of the superior. There is little doubt that the efficiency of the valvula coli is largely due to the oblique manner in which the ileum enters or invaginates the large intestine; this oblique passage alone, as in the case of the ureter piercing the wall of the bladder, would probably be sufficient to prevent a return of the caecal contents. In the great majority of cases, when in position within the body, the ileum is perfectly protected from such a return although when the parts are removed, and then Plo# Section distend
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
