Human sperm head vacuoles are physiological structures formed during the sperm development and maturation process.

@article{Tanaka2012HumanSH,
  title={Human sperm head vacuoles are physiological structures formed during the sperm development and maturation process.},
  author={Atsushi Tanaka and Motoi Nagayoshi and Izumi Tanaka and Hiroshi Kusunoki},
  journal={Fertility and sterility},
  year={2012},
  volume={98 2},
  pages={
          315-20
        }
}
OBJECTIVE To clarify whether human sperm vacuoles affected intracytoplasmic sperm injection (ICSI) success rates. DESIGN Retrospective study. SETTING A private infertility clinic. PATIENT(S) Spermatozoa and spermatids were obtained from 11 normozoospermic, 10 oligozoospermic or asthenozoospermic, 4 obstructive azoospermic, and 3 nonobstructive azoospermic men. INTERVENTION(S) Differential interference contrast observation and intracytoplasmic injection of morphologically selected sperm… CONTINUE READING
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