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ROBO-SPERM
SOURCE: Wellcome ImagesB0007805 Sperm cell
Digital artwork/Computer graphic by Anna Tanczos

THE STRUCTURE OF A SPERM CELL
The male gamete

Each single spermatozoan (plural spermatozoa) contains a haploid number of chromosomes (one copy of each) in the nucleus situated in the head region.

Surrounding the head of the sperm cell is the acrosome cap [shown in blue] - this contains special enzymes that digest the zona pellucida (the membrane surrounding the egg cell) to assist in fertilization.

The mid piece of the sperm cell contains two centrosomes [in green] and coiled mitochondria [gold]. The sperm will contribute both centrosomes to the embryo upon fertilization, which are essential for organising microtubules and thus subsequent cell divisions of the embryo.

The large coiled mitochondria [gold] provide the sperm with the energy supplied to the long flagella (or tail) required for it motility.

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