The acrosome, also known as the acrosomal cap, is a helmet-like structure which covers the front section of the head portion of a sperm cell. It contains a compartment of enzymes which develops during spermatogenesis (sperm production). Enzymes contained in this compartment assist in the process of fertilisation. They are only released if the sperm comes into contact with a female egg at which point they breakdown the shell of the egg to enable entry of the sperm and subsequent fertilisation.

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