The American journal of anatomy . th, the trabeculae pre-sent a confusing network. The epithelium of both the hepaticducts and trabeculae are heavily laden with yolk-granules, andthat of the ducts is not yet differentiated into a distinct columnartype. However, the right and left hepatic ducts are clear. In DEVELOPMENT OF LIVER AND PANCREAS 235 an 11 nim. embryo the right duct is distinctly divided into lateraland medial rami. A short cystic duct is attached to the caudalend of the lateral ramus and on its ventral side. In an embryosomewhat less than 13 mm. long the same arrangement of ashort
The American journal of anatomy . th, the trabeculae pre-sent a confusing network. The epithelium of both the hepaticducts and trabeculae are heavily laden with yolk-granules, andthat of the ducts is not yet differentiated into a distinct columnartype. However, the right and left hepatic ducts are clear. In DEVELOPMENT OF LIVER AND PANCREAS 235 an 11 nim. embryo the right duct is distinctly divided into lateraland medial rami. A short cystic duct is attached to the caudalend of the lateral ramus and on its ventral side. In an embryosomewhat less than 13 mm. long the same arrangement of ashort common duct and right and left hepatic ducts is right duct is divided into the medial and lateral rami. Thecystic duct here projects somewhat to the left and dorsal wardconnecting as before with the right lateral ramus. In a graphic reconstruction of a 13 mm. embryo (fig. 18)the right hepatic duct is divided into lateral and dorso-medialrami. The short cystic duct extends upward and opens into the Q^(^ Rrvd D/15. R/d-. .ms Fig. 20 Anterior view of a reconstruction of the lumina of hepatic ductsand gall-bladder of a 9 mm. embryo. X 100. , right hepatic duct; ,left hepatic duct; , gall bladder; , right lateral ramus; , left lateralramus; , right medial ramus; , left medial ramus. right lateral ramus. A short lateral branch is the only otherdivision of the right lateral ramus. The dorso-medial branchshortly breaks up into trabeculae. The left duct is also dividedinto rami. The differentiation of hepatic ducts from trabeculaeis now clearer as the epithelium of the former is columnar intype. In figure 19 from an embryo less than 1 mm. longer than theabove, the formation of ducts is seen to have continued. Theright hepatic duct is divided into lateral and medial rami, eachof which is further divided into dorsal and ventral same holds true in a general way for the left hepatic ductand its divisions. 236 E. A. BAUMGARTNER
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectanatomy
