. Journal of anatomy. total length from fixedpoint to vestibule was only 13 cm., while in another with the left colonfreely mobile on a defined mesocolon the length was 28 cm. The Folds in Marsupials. (a) Wombat (Phascolomys).—There is a well-defined duodenal loop,and, as in the human, four portions may be recognised (fig. 3). It first The Peritoneum and Intestinal Tract in Monotremes and Marsupials 283 passes down and out for 2-3 cm., then descends for 9-12 cm., theninwards for 1-5 cm., and finally passes up and to the left of the midline to the duodeno-intestinal flexure for 3 cm. Owing to t
. Journal of anatomy. total length from fixedpoint to vestibule was only 13 cm., while in another with the left colonfreely mobile on a defined mesocolon the length was 28 cm. The Folds in Marsupials. (a) Wombat (Phascolomys).—There is a well-defined duodenal loop,and, as in the human, four portions may be recognised (fig. 3). It first The Peritoneum and Intestinal Tract in Monotremes and Marsupials 283 passes down and out for 2-3 cm., then descends for 9-12 cm., theninwards for 1-5 cm., and finally passes up and to the left of the midline to the duodeno-intestinal flexure for 3 cm. Owing to the dorsalfixation of the pancreas, which fills the loop, the duodenum presentslittle independent mobility, being less mobile than in other ]\Iarsupials— it has a shorter mesoduodenum, although I have not met any caseof actual adhesion of the descending duodenum to liver or kidney as in CESOPMAGUS PYLORIC SPHINCTEfi DUOO FixEo Colon & Pouches ffOOT OF : INTES: rLEX: ffT PHOX: COLON. MESOCOLONMESENTERY Fig. 3.—The gastro-intestinal tract of Wombat (Pliascolomys). Echidna In relation with the distal portion there is a right lateral orduodenal fold connecting it to the dorsal wall ventral to the left psoasminor and proximal to the attachment of the mesocolon of the leftcolon. The fold is transverse above, being 5-1 cm. in width, whilebelow the lower free margin is 2-2*5 cm. in width and more oblique-Between the upper part of fold—the root of mesentery—and duodeno-intestinal flexure a small pocket is noted—primary duodenal fossa. Inone specimen with the duodenum more fixed dorsally no duodenal foldnor fossa could be demonstrated, thus resembling Echidna. 284 Dr W. Colin Mackenzie The ileo-cfeeal region lies close to the root of the mesentery, and majbe regarded as a fixed part of intestine. The distance between this regionand the attached colon at pylorus is 6 cm. The proximal or right colonextends from the ileo-ca^cal junction to the pylori
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
