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Sperm – Structure, Function and Male Fertility
Sperm are the male reproductive cells responsible for fertilizing the egg. They are produced in the testes and are essential for male fertility.
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Sperm are the male reproductive cells responsible for fertilizing the egg. They are produced in the testes and are essential for male fertility.
What Are Sperm?
Sperm (also called spermatozoa or sperm cells) are the male reproductive cells (gametes). They are produced in the testes through a process called spermatogenesis and carry the paternal genetic material (DNA). Their primary function is to travel to and fertilize a female egg cell (ovum), initiating pregnancy.
Structure of a Sperm Cell
A single sperm cell consists of three main parts:
- Head: Contains the cell nucleus with the haploid set of chromosomes (23 chromosomes) and the acrosome, an enzyme-filled cap that helps penetrate the outer layer of the egg.
- Midpiece: Packed with mitochondria that produce energy (ATP) to power the sperm movement.
- Tail (Flagellum): The long whip-like extension that propels the sperm forward with a characteristic swimming motion.
Sperm Production (Spermatogenesis)
Spermatogenesis takes place in the seminiferous tubules of the testes and takes approximately 64–74 days in humans. It involves several stages:
- Proliferation: Division of spermatogonia (precursor cells) through mitosis.
- Meiosis: Reduction of the chromosome number to the haploid set (23 chromosomes).
- Spermiogenesis: Maturation of round spermatids into fully formed sperm cells.
The sperm then undergo further maturation in the epididymis, where they acquire full motility.
Sperm Quality and Male Fertility
Sperm quality is a key factor in male fertility. The World Health Organization (WHO) defines the following reference values for a semen analysis:
- Concentration: at least 16 million sperm per milliliter of ejaculate
- Total count: at least 39 million sperm per ejaculate
- Motility: at least 42% motile sperm
- Morphology: at least 4% normally shaped sperm (by Kruger criteria)
Deviations from these values may indicate oligospermia (too few sperm), asthenospermia (reduced motility), or teratospermia (abnormal forms).
Factors Affecting Sperm Quality
Various factors can influence sperm production and quality:
- Elevated scrotal temperature (e.g., from tight clothing or frequent sauna use)
- Smoking, alcohol, and drug use
- Stress and sleep deprivation
- Environmental toxins and endocrine-disrupting substances
- Medical conditions such as varicocele, mumps orchitis, or hormonal disorders
- Certain medications (e.g., chemotherapy agents, anabolic steroids)
Diagnosis of Sperm Problems
The most important diagnostic tool is the semen analysis (seminogram), in which a semen sample is examined in a laboratory. The number, motility, and morphology of the sperm are assessed. Additional tests may include hormonal blood tests, genetic testing, or a testicular biopsy.
Treatment for Reduced Sperm Quality
Depending on the cause and severity, several treatment options are available:
- Lifestyle modifications (diet, exercise, quitting smoking and alcohol)
- Hormone therapy for hormonal disorders
- Surgical interventions (e.g., varicocele repair)
- Assisted reproductive technologies such as IUI (intrauterine insemination), IVF (in vitro fertilization), or ICSI (intracytoplasmic sperm injection)
References
- World Health Organization (WHO): WHO laboratory manual for the examination and processing of human semen, 6th edition, 2021.
- Nieschlag E., Behre H.M., Nieschlag S.: Andrology – Male Reproductive Health and Dysfunction. Springer, 3rd edition, 2010.
- Cooper T.G. et al.: World Health Organization reference values for human semen characteristics. Human Reproduction Update, 16(3):231–245, 2010.
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