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Sperm structure and compartments. General structure of spermatozoa, which consists of a head and a flagellum. The head contains the nucleus and the acrosomal granule. The flagellum, which is connected to the head by the neck, is divided into 3 components: the midpiece with the mitochondria, the principal piece, and the end piece. The axial filament contains the 9 + 2 array of the microtubules. This sperm pattern shows much variation across vertebrate taxa.
