SPRINGER MEDIZIN / SCIENCE PHOTO LIBRARY SPRINGER MEDIZIN / SCIENCE PHOTO LIBRARY
Sperm cell anatomy. Cutaway computer artwork showing the internal structure of a sperm cell (spermatozoon), the male sex cell. Each sperm cell consists of a head (upper right), mid-piece (lower left) and tail. The head contains the acrosome (green, upper right), which will pierce the egg's membrane during fertilisation, and the nucleus, within which is the genetic material. The mid-piece contains the centriole (fat, pink) and numerous mitochondria (oval) that provide the energy necessary for the cell to swim. The tail contains microtubules arranged in a central axial filament (axoneme, pink) that spins in a twisting motion to propel the sperm towards the egg for fertilisation.
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