Zona pellucida

The yolk sac in man contains no nutrients so in this aspect is vestigial. However, the its embryonic endodermal roof is the source of the mucous membrane of almost the entire ...

trofoblaste

Anatomie; Anatomie du développement

A granular protoplasmic body; a plastid, formed from cytotrophoblast, eventually surrounds the entire embryo; insert themselves between uterine epithelial cells, then spread along ...

ventralward

Anatomie; Anatomie du développement

Toward a belly, venter, or ventral aspect.

zgavër segmentimit

Anatomie; Anatomie du développement

The fluid-filled cavity of the mass of cells produced by cleavage of a fertilized ovum.

segment

Anatomie; Anatomie du développement

One of the paired, block like masses of mesoderm, arranged segmentally alongside the neural tube of the embryo, forming the vertebral column and segmental musculature.

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Secteur d’activité/Domaine : Vacances Catégorie : Vacances non officielles

Smokeout Great American

Observed every year since 1977, the Great American Smokeout takes place on the third Thursday of November. Sponsored by the American Cancer Society, ...