Early stages of pregnancy. Diagram depicting early stages of pregnancy from conception to four weeks. A cross-section of the female reproductive system is seen in the foreground. The ovary releases the oocyte into the fallopian tube (ovulation). A sperm penetrates it and the parental chromosomes mix. The fertilised egg cell divides into a zygote and continues to increase in cell number. It enters the uterus and forms a hollow blastocyst and implants in the uterine lining. The placenta and umbilical cord are formed which nourish the foetus until birth | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Osterwalder, Hans-Ulrich |
Bildgröße: | 3508 px × 4961 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |