MOTTA & FAMILIARI / ANATOMY DEPT. / UNIVERSITY "LA SAPIENZA", ROME / SCIENCE PHOTO LIBRARY MOTTA & FAMILIARI / ANATOMY DEPT. / UNIVERSITY "LA SAPIENZA", ROME / SCIENCE PHOTO LIBRARY
In vitro fertilisation (IVF): ovum post ovulation. False-colour scanning electron micrograph (SEM) of a single human ovum (egg), showing its protective covering, the zona pellucida (red) & remnants of the layer of follicular cells that form the corona radiata. Mature ova develop from primordial follicles formed during foetal development that remain dormant until sexual maturity. Every month, up to 20 follicles are activated to form primary follicles; normally only one attains full maturity to be released when the follicle ruptures at ovulation. Magnification: x470 at 6x7cm size.
Model release not required. Property release not required.