Glossary of The Cell (5th ed.) by Alberts et al. (2008)
Region at the head end of sperm cell that contains a sac of hydrolytic enzymes used to digest the protective coating of the egg. When a sperm starts to enter an egg, the contents of the vesicle are released (the acrosome reaction), helping the sperm penetrate the zona pellucida.
- Alberts, B., Johnson, A., Lewis, J. Raff, M., Roberts, K. & Walter P. 2008. Molecular Biology of the Cell, 5th ed. -xxxiv + 1463 pp. Garland Science, New York.