Medical research

New fertility hope for the sons of IVF

Infertility concerns have eased among men conceived by the most common form of IVF, with new research showing little or no difference in their reproductive health compared to men conceived naturally.

Obstetrics & gynaecology

New micro-device injects a boost to IVF success

A research team led by the University of Adelaide, in partnership with medical technology company Fertilis, has delivered a ground-breaking new micro-device to streamline the only fertility treatment procedure available for ...

Medical research

New measure of sperm age may be predictor of pregnancy success

A novel technique to measure the age of male sperm has the potential to predict the success and time it takes to become pregnant, according to a newly published study by researchers at the Wayne State University School of ...

Medical research

Frozen testicular tissue still viable after two decades

Male testis tissue that is cryopreserved can be reimplanted after more than 20 years and will go on to make viable sperm, according to a new study in rodents in the open-access journal PLOS Biology by Eoin Whelan of the School ...

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Sperm

The term sperm is derived from the Greek word (σπέρμα) sperma (meaning "seed") and refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell. A uniflagellar sperm cell that is motile is referred to as a spermatozoon, whereas a non-motile sperm cell is referred to as a spermatium. Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a totipotent zygote is formed with the potential to develop into a new organism.

The spermatozoa of animals are produced through spermatogenesis inside the male gonads (testicles) via meiotic division. They are carried out of the male body in a fluid known as semen. Mammalian sperm cells can live for up to 3 days inside the female reproductive system.[citation needed]

Sperm cells in algal and many plant gametophytes are produced in male gametangia (antheridia) via mitotic division. In flowering plants, sperm nuclei are produced inside pollen.

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