zona pellucida

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zona pellucida

[′zō·nə pə′lüs·əd·ə]
(histology)
The thick, solid, elastic envelope of the ovum. Also known as oolemma.
References in periodicals archive ?
In our study, the pellucid zone of the vitellogenic oocytes showed two layers of neutral glycoproteins in all species, which is a common content of pellucid zone of vertebrates (Lubzens et al.
This assumption is reinforced by ultrastructure studies showing, in species with adhesive eggs, follicular cells with a large amount of organelles that synthesize mucosubstances that are transferred to the pellucid zone for a strong adhesiveness of the eggs to the substratum (Andrade, Bazzoli, Rizzo, & Sato, 2001; Rizzo et al.
On the fourth day it has differenciated as a blastocyst and on the seventh day it finally hacht from the pellucid zone (Fig.