Sperm is the motile cell in males which is also known as spermatozoa.
It fuses with the ova to form the zygote.
It consists of :- 1) Head, 2) Neck, 3) Middle piece and 4) Tail.
The head of the sperm is a spherical structure with a large nucleus and a dome-shaped acrosome at its tip.
This acrosome release an enzyme called hyaluronidase which degrades the hyaluronic acid of the ovum and thus, it penetrates the ovum which leads to fertilization of the egg.