To answer this question, I will split the answer into various figures, each one corresponding to a stage in the journey:
- There are approximately 200-250 million sperm in each ejaculation, but only about 2 million make it to the cervix.
- Once there, out of the 2 million sperm entering the cervix, only about 1 million are able to make it to the uterus.
- Out of the 1 million that enter the uterus, only 10,000 are able to travel to the top of this organ.
- Out of the 10,000 that survive at this point, only half of them travel in the right direction, that is, toward the egg cell.
- Out of the approximately 5,000 sperm that enter the utero-tubal junction, about 1,000 get inside the Fallopian tube.
- Finally, out of the 1,000 that enter the tube, it is estimated that only 200 make it to the egg.
However, in the end, only 1 sperm out of the 200 that reach the egg is able to penetrate and fertilize it.
Suggested for you: Sperm’s Journey to the Egg – How Sperm Meets Egg with Pictures.