A City University of Hong Kong (CityUHK) research team led by Professor Michael Yang Mengsu, Senior Vice-President (Innovation and Enterprise), and Yeung Kin Man Chair Professor of Biomedical Sciences, collaborated with mainland ...
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According to a World Health Organization (WHO) study (2017), about half of all infertility is due to men. Semen analysis is considered essential for diagnosis of male infertility, but is not readily available at medical institutions ...
Jul 31, 2024
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Women in Europe are receiving more cycles of in vitro fertilization (IVF) and intrauterine insemination (IUI), according to data presented today at the ESHRE 40th Annual Meeting in Amsterdam.
Jul 8, 2024
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An unexpectedly versatile and regenerative stem cell in early embryos may be key to creating new effective fertility treatments, suggests a new study in mice from the University of Copenhagen.
Jun 24, 2024
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Conversations around fertility are often centered around women. Infertility is not just an issue occurring among females; males also experience infertility. A Baylor College of Medicine urologist explains the factors affecting ...
Jun 21, 2024
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Seminoma, a type of testicular cancer that predominantly affects young men, is the most common testicular germ cell tumor and is characterized by its similarity to primordial germ cells (PGCs), the precursor to sperm cells ...
Jun 19, 2024
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Researchers have discovered that the hepatitis E virus is associated with sperm in pigs, which suggests the virus may be both sexually transmitted and linked to male infertility, according to a new study published in PLOS ...
Jun 18, 2024
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Each cell contains a set of instructions in its DNA that determines which genes are expressed and which are silenced. The correct programming of these so-called epigenetic programs, including DNA methylation, is essential ...
Jun 11, 2024
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The widely held view that sperm counts in men are dropping around the world may be wrong, according to a new study by University of Manchester, Queen's University in Kingston, Canada and Cryos International, Denmark.
Jun 5, 2024
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Researchers at the University of São Paulo (USP) in Brazil have shown for the first time that SARS-CoV-2, the virus that causes COVID-19, can remain in the sperm of patients for up to 90 days after hospital discharge and ...
Jun 4, 2024
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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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