File:Human-spermatozoa EM01.jpg

From Embryology

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Human Spermatozoa ( transmission electron micrograph)

spermatozoa cartoon

Montage transmission electron micrograph of a human sperm cell.

The cell has a compact nucleus, conspicuous mitochondria, no endoplasmic reticulum, minimal cytoplasm and a large tail (about 45 μm in length). Superfluous cytoplasm and associated machinery is jettisoned when the sperm emerges from the testis, leaving a 'stripped down', minimalist cell.


  • Cell membrane - containing membrane proteins for chemotaxis and binding to the oocyte zone pellucida.
  • Acrosome - containing enzymes required to digest the zona pellucida. The acrosome develops as a highly modified golgi structure.
  • Nucleus - containing male haploid genome required to combine with oocyte haploid genome to form diploid zygote.
  • Neck - Centriole and axonema required for spermatozoa movement.
  • Middle piece - Mitochondria and annulus required for energy for spermatozoa movement.
  • Principal piece - Microtubules required for spermatozoa movement.


Human Spermatozoa EM: Image - cap-phase spermatid | Image - elongated spermatid | Image - spermatid | Image - spermatozoa | Image - normal nucleus | Image - nucleus | Image - abnormal nucleus | Spermatozoa Development | Category:Electron Micrograph
Spermatozoa Images: Spermatozoa BF | Spermatozoon BF | Spermatozoon EM | Spermatozoon EM | Historic drawing | Category:Spermatozoa | Spermatozoa Development | Testis Development

Reference

<pubmed>19678911</pubmed>| PMC: 2736672 | J of Biology


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Barratt et al. Journal of Biology 2009 8:63 doi:10.1186/jbiol167

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current13:24, 5 April 2010Thumbnail for version as of 13:24, 5 April 20101,000 × 204 (26 KB)S8600021 (talk | contribs)Montage transmission electron micrograph of a human sperm cell. The cell has a compact nucleus, conspicuous mitochondria, no endoplasmic reticulum, minimal cytoplasm and a large tail (about 45 μm in length). Superfluous cytoplasm and associated machine