Veterinary Andrology and Reproductive Techniques

GOLGI PHASE

• The newly formed spermatid (A) has a well-developed golgi apparatus.
• Small vesicles of the golgi fuse, giving rise to larger secretory granules called proacrosomic granules (B)
• Vesicle fusion continues until a large acrosomic vesicle is formed that contains a dense acrosomic granule (C)
• During the last half of the golgi phase the centrioles migrate to a position opposite to the acrosomic vesicle
• Proximal centriole (PC) gives rise to the attachment point for the tail
• Distal centriole (DC) will give rise to the developing axoneme inside the cytoplasm of the spermatid.

The axoneme is the central portion of a flagellum