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Structure of sperm

Sperm ( 1 ) Sperm is microscopic , elongated haploid motile male gamete produced by spermatogenesis .  ( 2 ) It measures to about 0.055 mm or 60μ in length .  ( 3 ) The sperm consists of head , neck , middle piece and tail . (1) Head :  (1) Head is the main part which is flat and oval and has a large nucleus and an acrosome.   (ii) Acrosome is formed from Golgi complex. It secretes enzyme hyaluronidase which helps in penetration of the egg during fertilization.   (iii) The acrosome and anterior half of nucleus is covered by a fibrillar sheath.  (2) Neck : Neck is short region having two centrioles.   (1) The proximal centriole plays a role in first cleavage of zygote.   (ii) The axial filament of the sperm is formed by the distal centriole.   ( 3 ) Middle piece :  ( 1 ) Middle piece acts as a power house for sperm .  2) It bears many spirally coiled mitochondria or Nebenkern around the axial filament. ...