Primordial egg cell in a human embryo. False- colour scanning electron micrograph of a primordial germ cell (green) surrounded by follicular cells (magenta). At this stage primordial germ cells,also known as oogonia,migrate from the yolk sac into the ovarian cortex where they multiply by mitosis. By the fourth and fifth months of foetal development the primordial germ cells number about seven million but of these only 1 million will be present at birth. By this stage they have become primordial follicles and will represent the patrimony of eggs in the woman's ovary. Magnification: x2240 at 6x7cm size. x2110 at 5x7cm | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / PROFESSORS P.M. MOTTA & S. MAKABE |
Taille de l’image : | 3907 px × 5216 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |