Spermatozoon is a mature male gamete or reproductive cell. A sperm cell comprises of a round or cylindrical nucleated cell. a short neck, and a thin motile tail. The structure of sperm is very important for its motility and function in sexual reproduction. The nucleus contains half of the genetic information and fuses with the ovum (female gamete) to form a zygote. A sperm cell determines the sex of its offspring in mammals, if it bears Y chromosome, then male offspring will be the result and if X chromosome the female offspring.

Diagrammatic representation of a sperm: