#sperm head cap
- Acrosome — A vesicular cellular formation, resembling a specialized lysosome, located as a cap or protective envelope on the anterior portion of the spermatozoon head nucleus. This structural organelle, derived from the Golgi apparatus during spermiogenesis, contains a large amount of potent hydrolytic enzymes (such as hyaluronidase and acrosin) destined to dissolve the outer protective zones of the ovum (zona pellucida) to allow penetration and biological fertilization.