Nucleus contain genetic information and half number of chromosomes. The acrosome releases a hyaluronidase enzyme which destroys the hyaluronic acid of the ovum and enters into the ovum. - See more at: http://www.biology.lifeeasy.org/95/what-is-the-structure-of-a-mature-human-sperm-cell#sthash.ZoGqVl6v.dpuf