Fig. 10. High power TEM of a stage 1a embryo in vitro in the area between the abstricted second polar body (PB2) and the embryo, three hours after insemination (original magnification x19,600). Released cortical granules are in the form of spherical blebs (small arrowheads) on either side of the cytoplasmic constriction. A few cortical granules in the polar body are releasing their contents into the subzonal space (large arrowhead).
Ib, interbody; M, dense mitochondrion; Mt, microtubules; Mv, microvilli.
( From: Sathananthan and Trounson, 1982. Reproduced with permission of the publisher, John Wiley & Sons.)
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