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  • 1
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Modifications of the gastro-intestinal tract of Nereis virens are two dorsolateral esophageal cecums, directed anteriorly and posteriorly from the point of attachment. The cecal and esophageal lumina are continuous. Each cecum is composed of acini, possessing a row of elongated cells, basement membrane, and intima. Fibro-elastic tissue is present. The elongated cells contain glycogen and fat.The hepatopancreas of Asterias vulgaris consists of two lobes in each ray, and the numerous acini empty into the bifurcated hepatopancreatic duct which leads into the pyloric stomach. The hepatic cells are columnar and contain glycogen and fat. Pancreatic cells lie in the midregion of the acini.The lobulate liver of Loligo pealii lies on the ventral surface of the duodenum. A capsular membrane envelops the organ. The acini possess basement membrane, columnar cells, and intima; their lumina anastomose, forming a common duct, which leads into the blind sac. The hepatic cells contain fat.The hepatopancreas of Melanoplus femur-rubrum consists of six cecums histologically continuous with the digestive epithelium of the pyloric stomach. Each cecum consists of simple and compound acini which empty into a duct leading to the pyloric stomach. Each acinus possesses basement membrane, columnar hepatic cells, pancreatic cells, and intima. The pancreatic cells occur in islets, usually adjacent to the basement membrane. The hepatic cells contain glycogen and fat.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The relation of the hepatopancreas to the pyloric stomach and its physiologic histology were studied. The organ consists of two lobes, united ventrally, which lie along the cardiac and pyloric stomachs and the intestine. Primary and secondary lobulations (acini) are present, and the entire organ is a system of anastomosing tubules (lumina). The tubules progressively converge and form a duct in each lobe which leads ventrolaterally into the pyloric stomach.Each acinus consists of a single layer of hepatic and pancreatic cells supported by a basement membrane, and the interacinar spaces are the seat of fibro-elastic tissue and phagocytic cells. The supporting tissue is laminar with that of the stomach. The arterial capillaries, composed of endothelial cells, lie in the interacinar spaces. The blood supply is by way of the basement membrane to the cells.The hepatic cells of specimens collected in September bear little fat; cells of June specimens are laden with fat. Glycogen is deposited in the hepatic cells; there is no difference between the quantity found in September and in June. The hepatic cells probably contain biliverdin. Chemical analysis indicates the presence of trypsin, amylase, and lipase.A review of the literature and a discussion of homologies with reference to the vertebrate liver are given.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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