pars hepatica

pars he·pat·'i·ca

the larger cranial division of the primordial embryonic hepatic primordium (bud), developing into the liver proper.
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Several theories have been proposed to explain the development of ectopic liver at different sites: development of an accessory lobe of the liver with atrophy or regression of the original connection to the main liver, (4) migration or displacement of a portion of the cranial part (Pars hepatica) of the liver bud to other sites, (6) dorsal budding of hepatic tissue before the closing of the pleuroperitoneal canal (may explain how EL develops in the thoracic cavity such as esophagus, pericardium, intra pleural or extra pleural), (7) trapping of hepatocyte-destined mesenchyma in different areas (8) and entrapment of nests of cells in the region of the foregut following closure of the diaphragm or umbilical ring.
The close relationship of the developing hepatic parenchyma cell cords to the pars cystica and early fetal duodenum may explain why ectopic hepatic tissue could be found in the wall of the gallbladder, the gastrohepatic ligament, the umbilical cord, the adrenal glands, the diaphragm, the pancreas, the pylorus, and the splenic capsule if a portion of the pars hepatica is displaced.
With further development this diverticulum forms the pars hepatica and pars cystica.
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