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A mammalian sperm is minute microscopic, flagellated and motile gamete with no nutritive material, protective enveopes and most of cell organelles like ribosome, and E.R. etc. It is basically formed of four parts each performing a specific functions. 1 Head: Shape or head varies in different mammals. It is generally oval and flat and formed of two parts acrosome and nucleus. Acrosome contain lytic enzyme called hyaluronidase which helps in the peneteration of ovum. 2 Neck: It is the smallest part and may be indistict. It is formed of two centriols perpendicular to each other and is formed from the cenrosome of spermatid. 3 Middle piece: It lies behind the neck and is cylinderical in the human sperm. It is formed of a mitochondrial spiral, nebenkern, around the proximal part of axoneme. 4 Tail: It is the longest part of sperm. It is slender and tapering part. It is formed of two parts; central contractile and microtubular part called axoneme or axial filament, and outer protoloasmic sheath. 5 Sperm : They Look Somewhat similar to a tadpole and they are about 40 Microns Long.

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16y ago

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