zona pellucida
/ˌzəʊnə pɪˈluːsɪdə
/noun (plural zonae pellucidae /ˌzəʊniː pɪˈluːsɪdiː/) Anatomy & Zoology
The thick transparent membrane surrounding a mammalian ovum before implantation.At this stage the embryo releases itself from the zona pellucida still surrounding it, and implants into the uterine wall....
- The embryo must hatch out of the zona pellucida prior to implantation into the uterine wall.
- The secondary oocyte and the polar body remain surrounded by the zona pellucida and the cumulus oophorus.
Origin
Mid 19th century: from Latin, literally 'pellucid girdle'.
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