A number of recent ultrastructural studies have shown marked differences between the two lining cell types in adult liver sinusoids, endothelial cells and Kupffer cells. In the present study, the ultrastructural features and electron microscopic cytochemistry of sinusoidal lining cells in the fetal liver were studied through fetal period to neonate in the rat. At fetal period, the sinusoid, which contains various blood component, in lined by the endothelial cells, the Kupffer cells and the fat storing cells that located in the space of Disse. As gestation proceeded, these eel's are arranged as adult liver sinusoids. The sinusoidal wall appears to be discontinuous with open fenestration between endothelial cells, but no basal lamina can observed. It seems to be morphologically and functionally distinct at the early gestation between the endothelial cells and the Kupffer cells, the latter showing marked phagocytized activity. The fat storing cells, which contain several fat droplets, are located in the space of Disse. Ultrastructural localization of the acid and alkaline phosphatase activity were noted on the sinusoidal lining cells.
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