Definition: The male gamete or sex cell that contains the genetic information to be transmitted by the male, exhibits autokinesia, and is able to effect zygosis with an oocyte. The human sperm is composed of a head and a tail, the tail being divisible into a neck, a middle piece, a principal piece, and an end piece; the head, 4–6 mcm in length, is a broadly oval, flattened body containing the nucleus; the tail is about 55 mcm in length.
[G. sperma, seed]
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