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subzonal insertion
(SUZI) An obsolete IVF technique involving sperm microinjection, in which one or more sperm are injected through the zona pellucida into the perivitelline space of the egg (the secondary oocyte. Not very effective, because its efficiency is limited by sperm having to have undergone the acrosome reaction). Nowadays completely replaced by intracytoplasmic sperm insertion (ICSI), where the acrosome reaction is not a requirement.
Terms that contain "subzonal insertion" in the definition
perivitelline space
The space between the egg (the vitellus -- the oocyte itself) and the zona pellucida; sperm are injected into this space with subzonal insertion, or SUZI.
sperm microinjection
Either intracytoplasmic sperm insertion (ICSI) or subzonal insertion (SUZI, now obsolete). Abbreviated SMI, although no longer in common usage.