Abstract
The liver is an organ notable for its sensitivity to a great variety of environmental factors. It is composed of a parenchyma divided into irregular lobules by the exocrine pancreas or hepatopancreas; the pancreatic cells are arranged around a branch of the portal vein. The hepatocytes are radially arranged in cords around a central sinusoid. The liver histomorphology and the organization of exocrine pancreatic tissue of O. jenynsii (Günther, 1864) is similar to the acinar morphology of many teleosts, including freshwater and marine species. The aim of the present work was to carry out the histological analysis of the liver of Oligosarcus jenynsii, one of the most common species inhabiting Los Padres Lake (Buenos Aires Province, Argentina).
Highlights
Three patterns of organization of vertebrate hepatic parenchyma have been described by EURELL & HAENSLY (1982): 1) the first pattern of hepatic parenchyma arrangement consists of hepatocytes, which are radially arranged around a central vein in interconnecting laminae of two cells thickness, sinusoids separating each lamina
As teleostean hepatic organization is concerned, several microscopic anatomy and histochemistry studies have been done on the liver of marine species, such as the hake Merluccius hubbsi, the white croaker Micropogonias furnieri, and the stripped weakfish Cynoscion guatucupa (DÍAZ et al, 1999).Among freshwater species, the histology and ultrastructure of the liver of the channel catfish Ictalurus punctatus, the tigerfish Hydrocynus forskahlii, the trout Oncorhynchus mykiss and the goldfish Carassius auratus have been described (HINTON & POOL, 1976; GEYER et al, 1996)
The liver of Oligosarcus jenynsii is composed of a parenchyma covered by a thin capsule of connective tissue
Summary
The liver has a primary array based on hepatocytes, bile canaliculi and sinusoids, and structural differences occur among species in stroma and parenchyma three-dimensional organization. Bile canaliculi are located between adjacent hepatocytes This pattern corresponds to the muralium or trabecular type, originally established by ELÍAS & BENGELSDORF (1952) for birds and mammals; 2) in the second pattern, sinusoids form an extensive network around the periphery of hepatocytes tubules. A bile canaliculus forms the center of the tubule This pattern has been described in the “ hagfish” Myxine glutinosa (MUGNAINI & HARBOE, 1967); 3) hepatocytes are arranged in anastomosed laminae around the central vein. As teleostean hepatic organization is concerned, several microscopic anatomy and histochemistry studies have been done on the liver of marine species, such as the hake Merluccius hubbsi, the white croaker Micropogonias furnieri, and the stripped weakfish Cynoscion guatucupa (DÍAZ et al, 1999).Among freshwater species, the histology and ultrastructure of the liver of the channel catfish Ictalurus punctatus, the tigerfish Hydrocynus forskahlii, the trout Oncorhynchus mykiss and the goldfish Carassius auratus have been described (HINTON & POOL, 1976; GEYER et al, 1996)
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