The liver, spleen, pancreas, peritoneal relations, and biliary system in monotremes and marsupials / by William Colin MacKenzie.
- William Colin Mackenzie
- Date:
- 1918
Licence: In copyright
Credit: The liver, spleen, pancreas, peritoneal relations, and biliary system in monotremes and marsupials / by William Colin MacKenzie. Source: Wellcome Collection.
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![portal interval it is a pointed extremity, i.e., is atrophy- ing. Although apparently so primitive, yet this liver would approach the human type if the left cystic and left lateral lobes were linked up. (D) Here the greatest width of the right mesial or cystic lobe was 3.5 cm., and of left 1.5 cm. The dorsal extremity of the left part was only l-3rd cm. wide, and did not reach the portal interval, i.e., the fissure for the cystic duct and the longitudinal fissure are being merged, since the dorsal portion of the left cystic is disappearing. Thus we see how the lobus quadratics becomes defined dorsally. Gall Bladder.—This is a somewhat broad sac, meas- uring, in a large specimen, 4-5 cm. dorso-ventrally, and about 3 cm. laterally. In one male specimen the gall blad- der was unusually small, only measuring 2 cm. dorso- ventrally, and 1 cm. laterally. It usually projects beyond the ventral border of the liver, and is lodged in the broad cleft or interval between the right and left portions of the mesial or cystic lobe (corresponding to the right and intermediate of the tripartite mesial lobe), and is seen both on the dorsal and ventral surfaces. It is mobile, being invested by peritoneum completely for the ventral 4-5ths, the dorsal l-5tli being invested on the upper and under surfaces, but bound lateral]v to the margins of the cleft. Cystic Duct.—This passes back in the groove on the under surface of the cvstic or median lobe, between its right and left divisions, though dorsally portion of the left lateral lobe may take part in its boundary. It ex- tends from the cleft for the gall bladder to the portal interval, and is invested by peritoneum on the under sur- face and sides being attached above. It measures 4.5 cm. to 6.5 cm. long, and is joined by the hepatic ducts, and becomes the common bile duct.](https://iiif.wellcomecollection.org/image/b29821125_0073.jp2/full/800%2C/0/default.jpg)
