Ovarian primordial follicles. Light micrograph of a section through the cortex of a neonatal ovary,showing clusters of primordial follicles each containing a single oocyte (egg cell) surrounded by a layer of follicle,or granulose,cells. The oocytes are the female germline cells. At birth in humans there may be up to one million primordial follicles in a pair of ovaries. Primordial follicles remain arrested in development until activated to enter a prolonged growth and maturation phase called folliculogenesis. In postnatal and early adult life perhaps 10-20 primordial follicles are recruited each day to enter the follicular growth process resulting in the gradual decline in their number such that at menopause,only a few hundred remain. Magnification: | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Microscape |
Bildgröße: | 5135 px × 3402 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |