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cumulus-oocyte complex
Pronunciation: CUE-mule-us OH-oh-site COM-plex
The egg surrounded by its supporting cumulus cells at the time of ovulation.
Full Definition
The cumulus-oocyte complex (COC) consists of a mature oocyte surrounded by layers of cumulus granulosa cells connected by an extracellular matrix rich in hyaluronic acid. This structure is essential for oocyte maturation, ovulation, and fertilization, with cumulus cells providing metabolic support and protection to the developing egg. In IVF procedures, the integrity and expansion of the cumulus complex serves as an indicator of oocyte maturity and quality, influencing decisions about timing of insemination or ICSI.
Usage
Usage note: Often abbreviated as COC in embryology reports; critical for oocyte quality assessment.
In Context
- "Examination of cumulus-oocyte complexes revealed appropriate expansion indicating oocyte maturity." — Embryology assessment notes
- "The cumulus-oocyte complex was carefully denuded prior to ICSI to assess nuclear maturation status." — Laboratory procedure documentation
Also known as
COC
cumulus complex
Don't confuse with
corona radiata
follicular fluid