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Sperm Structure and Semen Composition01:22

Sperm Structure and Semen Composition

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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Sexual stimulation can take various forms, such as physical touch and visual or auditory cues. When this happens, the parasympathetic reflex in the sacral portion of the spinal cord is activated. This reflex stimulates the release of nitric oxide (NO), which then dilates the arterioles in the penis, increasing blood flow to the erectile tissues - the corpora cavernosa and corpus spongiosum.
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The male reproductive system is a complex network of organs and tissues that work together to produce and transport sperm. The epididymis, vasa deferens, ejaculatory ducts, and urethra are the accessory ducts involved in sperm maturation and transportation. These ducts play a critical role in the production and transportation of sperm from the testes to the urethra, where it is then released during ejaculation.
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Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects
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Seasonal Variations in Human Semen Parameters: A Systematic Review and Meta-Analysis.

Hojat Dehghanbanadaki1, Zane Randell1, Tyler Cain2

  • 1Division of Urology, Department of Surgery, University of Utah Health, Salt Lake City, Utah, USA.

Andrology
|December 31, 2025
PubMed
Summary

Male fertility shows seasonal variation, with semen quality peaking in winter and spring. Sperm concentration, total sperm count, and motility are generally better in colder months compared to summer and fall.

Keywords:
latitudemale fertilitymeta‐analysisseasonseasonalitysemen parameters

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Area of Science:

  • Reproductive biology
  • Environmental health
  • Statistical analysis

Background:

  • Male fertility is susceptible to environmental factors, including seasonal changes.
  • Previous research on seasonality's impact on semen quality yielded inconsistent results.
  • Understanding seasonal patterns is crucial for accurate fertility assessments.

Purpose of the Study:

  • To systematically review and meta-analyze data on seasonal variations in human semen parameters.
  • To clarify the relationship between seasons and semen quality metrics.

Main Methods:

  • A comprehensive literature search was conducted across PubMed, Web of Science, and Scopus.
  • 21 studies investigating semen parameters across seasons were included in the meta-analysis.
  • Random-effects models were used to calculate pooled weighted mean differences in semen parameters.

Main Results:

  • Winter and spring demonstrated superior semen quality compared to summer and fall.
  • Higher sperm concentration (3.24-6.07 million/mL) and total sperm count (14.63-19.74 million) were observed in colder months.
  • Reduced slow motility (5.17%-11.75%) and improved normal morphology were noted in winter and spring.

Conclusions:

  • Significant seasonal variations in semen parameters exist.
  • Winter and spring are associated with enhanced semen quality indicators.
  • These findings aid in optimizing the interpretation of fertility evaluations based on season.