Spermatozoa need to have progressive motility to reach their ultimate goal: fertilizing the egg cell. During their journey toward the Fallopian tubes, where the egg is located, they must overcome a series of barriers and swim rapidly toward the oocyte, as only the fastest will be able to fertilize it.
The path of the sperm cells to the oocyte
By Andrea Rodrigo BSc, MSc (embryologist), Laura Mifsud Elena BSc, MSc (embryologist), Zaira Salvador BSc, MSc (embryologist) and Sandra Fernández BA, MA (fertility counselor).
Last Update: 12/04/2018