Sperm is comprised of a head, neck, middle piece and tail. The whole-body of sperm is enveloped by plasma membrane.
Structure of Sperm
- Head contains acrosome apically, which contains enzymes that facilitate entry of sperm into the ovum. It is followed by an elongated nucleus (haploid)
- Middle piece has multiple mitochondria, that provide energy for the movement of sperms
- Tail is a flagellum that protrudes out of the cell body and is responsible for the vigorous motility of sperms. The tail helps sperms in swimming so that they can reach towards the ovum
- Around 200-300 million sperms are ejaculated at once