Abstract
Summary The process of fertilization and the sperm storage in the female apparatus in Parascaris equorum is described in this paper. The sperm approaches the egg by means of pseudopodia containing bundles of microfilaments. The sperm and egg membranes fuse and the sperm penetrates progressively into the ovum. The egg and sperm plasma membranes and glycocalyces disappear at the point of fusion. At the end of fertilization, they are reformed at the egg's surface, while the egg and sperm chromatin begins to decondense. Spermatozoa are stored in the female apparatus prior to fertilization; here they come into contact with the epithelial cells of the spermatheca, protruding pseudopodia rich in microfilaments into the cellular body.
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