Living reference work entry
This term describes the outermost layer of the hydatid cyst, which is formed by the tapeworm Echinococcus granulosus in intermediate hosts (e.g., sheep, cattle) or in humans. This pericyst consists of depressed/degenerated host cells, while the inner layers (germinal layer, laminated layer) are of parasite origin. The pericyst protects the hydatid and the therein included protoscolices, which after ingestion by the final hosts (dogs) grow up to the typical adult worm. Ye and Mehlhorn ( 2015) showed that long, tiny channels protrude from the surface of the hydatid, pass through the pericyst, and reach until the healthy tissue of the host (Figs. 1 and 2). Apparently these channels are used to import substances needed for the growth of the hydatid.
KeywordsHost Cell Intermediate Host Healthy Tissue Adult Worm Hydatid Cyst
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