Relating to an early stage in the development of the acrosome.
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(5) A proacrosomal vesicle (pa) and Golgi membranes (G) are observed near the nucleus.
In addition to the many mitochondria, the cytoplasm now contains a Golgi body with up to seven cisternae; well-developed rough endoplasmic reticulum; spherical membrane-bound electron-dense vesicles (up to 0.3-[micro]m diameter) that we believe to be proacrosomal vesicles; two centrioles; and a short axoneme (Fig.
The most prominent feature of this phase of spermiogenesis is the large proacrosomal vesicle, one surface of which is closely associated with the plasma membrane.
In early spermiogenesis, the Golgi body secretes numerous vesicles of varying density, some of which fuse to form a proacrosomal vesicle [ILLUSTRATION FOR FIGURE 1 OMITTED], which becomes ovoid and attaches to the plasma membrane by some granular material [ILLUSTRATION FOR FIGURE 2 OMITTED].
Moreover, in our study, proacrosomal vesicle formation occurs in the spermatid stage, whereas Sousa and Oliveira (1994) report its occurrence in the primary spermatocyte.