Sperm motility describes the ability of sperm to move properly through the female reproductive tract internal fertilization or through water external fertilization to reach the egg. Sperm motility can also be thought of as the quality , which is a factor in successful conception ; sperm that do not "swim" properly will not reach the egg in order to fertilize it. Sperm motility in mammals also facilitates the passage of the sperm through the cumulus oophorus a layer of cells and the zona pellucida a layer of extracellular matrix , which surround the mammalian oocyte. In the wood mouse Apodemus sylvaticus , sperms aggregate in 'trains' that are better able to fertilize eggs because they are more capable of navigating the viscous environment of the female reproductive tract. The trains move in a sinusoidal motion. Sperm motility is also affected by certain factors released by eggs.
Everything You Need to Know About Artificial Insemination
NOVA Online | 18 Ways to Make a Baby | Fertility Throughout Life (text version)
Artificial insemination is a fertility treatment method used to deliver sperm directly to the cervix or uterus in the hopes of getting pregnant. Two chief approaches to artificial insemination exist: intrauterine insemination IUI and intracervical insemination ICI. Some women may also take medications to stimulate ovarian follicle growth and increase conception chances. In these instances and other situations, artificial insemination may help a woman conceive.
How Many Days can Sperm Live in a Woman's Body?
It is well understood that a myriad of complex steps occur between the time of ejaculation and the union of the haploid number of chromosomes from each partner that results in the final process of fertilization. Consequently, it is easy to imagine the numerous potential problems that can occur at each step, and thus may prevent a successful pregnancy. Often overlooked are the complexities of sperm transport and the steps that must occur in the sperm, a process known as capacitation, before fertilization can occur. These processes of sperm delivery and potentiation are addressed in detail in this chapter. Vaginal Insemination The complex process of sperm transport through the female reproductive tract begins at the time of ejaculation.