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Human micro-insemination by injection of single or multiple sperm: ultrastructure
A H Sathananthan1, S C Ng, A Trounson
1Centre for Early Human Development, Monash Medical Centre, Melbourne, Australia.
Human Reproduction (Oxford, England)
|July 1, 1989
Summary
Micro-insemination techniques were examined using electron microscopy. Sperm transfer into the oocyte
Area of Science:
- Reproductive Biology
- Cell Biology
- In Vitro Fertilization
Background:
- Micro-insemination involves sperm transfer into oocytes for fertilization.
- Understanding sperm-oocyte interactions is crucial for IVF success.
Purpose of the Study:
- To examine micro-insemination processes via transmission electron microscopy.
- To assess sperm morphology and acrosomal status post-transfer.
Main Methods:
- Sperm injection into oocytes using micromanipulators (zona-puncture or direct injection).
- Sperm preparation (washing, capacitation) and oocyte recovery methods.
- Transmission electron microscopy for ultrastructural analysis of sperm and oocytes.
Main Results:
- Normal fertilization observed after single sperm transfer.
- Polyspermic fertilization occurred with multiple sperm transfer, suggesting a vitelline block.
- Sperm transfer was less invasive than direct injection; zona drilling created larger breaches.
Conclusions:
- Micro-insemination techniques can lead to fertilization and pregnancy, even in cases of severe oligozoospermia.
- Sperm morphology and acrosomal status impact fertilization outcomes.
- The vitelline block to polyspermy may be present in human oocytes.