Centrolecithal Ovum

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centrolecithal ovum

[¦sen·tro′les·ə·thəl ′ō·vəm]
(cell and molecular biology)
An egg cell having the yolk centrally located; occurs in arthropods.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Centrolecithal Ovum


a female reproductive cell, or ovum, whose cytoplasm contains a large quantity of centrally located yolk. Cytoplasm containing no yolk is found mainly on the surface of the ovum; only a small portion of cytoplasm occurs in the center of the ovum, where the nucleus is located. The central portion of the cytoplasm is connected to the peripheral layer of cytoplasm by delicate strands that pass through the yolk layer. Centrolecithal ova are characteristic of many arthropods, in particular, insects. When a centrolecithal ovum undergoes cleavage, the nucleus divides many times. The resulting nuclei migrate along the cytoplasmatic strands to the surface of the ovum, where cells form around them. This cleavage is called superficial.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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