Under normal circumstances, fertilization occurs in one of the Fallopian tubes, then the fertilized egg begins to make its way to the uterus. By about the fifth day after conception, the embryo finally reaches the uterus, where it implants itself in the endometrium, or uterine lining. read more
In women, this condition affects the cervix, uterus, and fallopian tubes. In men, it affects the urethra by causing painful urination and an abnormal discharge. It can also affect the mouth, throat, and anus of both men and women. read more
Implantation happens when a fertilized egg attaches itself to the uterine wall. Once fertilization occurs, the fertilized egg remains in the fallopian tube for 3 days. It then enters the uterus where it gets very close to the lining of the uterus (endometrium) and begins to invade this endometrium to implant. read more
Some embryos fail to implant in the womb, while others implant successfully, leading to pregnancy, and a new study sheds light on why that's the case. In the study, researchers found that human embryos typically produce a chemical called trypsin, which signals the womb to prepare its lining for implantation. read more