Longitudinal section of a sperm head showing the perforatorium (p), acrosomal vesicle
(a), and extra-acrosomal tissue (e).
edulis, the plasma membrane of the acrosomal vesicle folds back onto itself during the acrosome reaction, exposing the inner acrosomal membrane (Dan 1970).
virginica have an ovoid head capped with the acrosomal vesicle (Fig.
Acrosome reaction in abalone sperm involves the exocytosis of the acrosomal vesicle
and the polymerization of subacrosoreal materials, composed mainly of actin, to form the anterior spike called acrosomal process (Neill & Vacquier 2004).
However, there was a significant decrease in sperm entry into the cytoplasm after binding by sperm that had lost their acrosomal vesicles
prior to binding.