cumulus-oocyte complex
Pronunciation: KYOO-mew-lus OH-oh-site COM-plex
The structural unit consisting of an oocyte surrounded by layers of cumulus cells within the ovarian follicle.
Full Definition
The cumulus-oocyte complex (COC) represents the functional unit within the ovarian follicle consisting of the oocyte surrounded by multiple layers of cumulus cells connected by gap junctions. These cumulus cells provide essential metabolic support to the developing oocyte and undergo expansion during final oocyte maturation in response to the LH surge. In IVF procedures, the morphology and expansion of the cumulus-oocyte complex serve as important indicators of oocyte maturity and developmental competence.
Usage
Usage note: Commonly abbreviated as 'COC' in laboratory reports. Important to distinguish from isolated cumulus cells.
In Context
- "The retrieved cumulus-oocyte complexes showed excellent expansion indicating proper maturation." — Laboratory assessment
- "Morphological evaluation of the COC predicted subsequent fertilization success." — Research documentation