PATHOLOGY

Detailed explanation-1: -Contact between the egg and sperm is random. Once the egg arrives at a specific portion of the tube, called the ampullar-isthmic junction, it rests for another 30 hours. Fertilization-sperm union with the egg-occurs in this portion of the tube. The fertilized egg then begins a rapid descent to the uterus.

Detailed explanation-2: -When your partner ejaculates, his sperm travel from your vagina through your cervix and into your uterus to the fertilized egg in your fallopian tube. Only about 400 sperm will survive the 10-hour journey to the egg and only one will succeed in burrowing through its outer membrane.