Also found in: Medical.


(invertebrate zoology)
Movement of the embryo into the yolk in some insect eggs.
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 It might be outdated or ideologically biased.



a bending of the embryo in the process of embryonic development of certain arthropods (spiders, Onychophora, insects) and cephalopod mollusks.

Two stages of blastokinesis are distinguished: catathrep-sis, bending of the embryo to the ventral side; and anathrepsis, to the dorsal side. In the process of blastokinesis, the orientation of the embryo in relation to the axis of the ovum may change to its opposite.

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