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Related Concept Videos

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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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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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
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Sperm Transport01:15

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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...
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Accessory Glands of the Male Reproductive System01:16

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The accessory ducts involved in sperm maturation and transportation include the epididymides, vasa deferentia, ejaculatory ducts, and urethra. These ducts play a critical role in the maturation, storage, and transportation of sperm from the testes to the urethra, where it is then released during ejaculation.
The epididymis is a small, comma-shaped organ located at the back of each testicle. The epididymis can be divided into three main parts: the head, body, and tail. The head of the epididymis...
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Accessory Ducts of the Male Reproductive System01:25

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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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Updated: Mar 31, 2026

Sperm Collection of Differential Quality Using Density Gradient Centrifugation
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Another look at human sperm morphology.

J Auger1, P Jouannet2, F Eustache3

  • 1Service d'Histologie-Embryologie, Biologie de la Reproduction/CECOS, Hôpitaux Universitaires Paris Centre, Site Port-Royal, 53, Avenue de l'Observatoire, 75014 Paris, France INSERM U1016, Equipe "Génomique, Epigénétique et Physiologie de la Reproduction", Institut Cochin, Université Paris Descartes, Paris, France jacques.auger@aphp.fr.

Human Reproduction (Oxford, England)
|October 17, 2015
PubMed
Summary
This summary is machine-generated.

A standardized assessment of human sperm morphology reveals distinct patterns of abnormalities in fertile men, infertile men, and testicular cancer patients. This detailed phenotyping provides valuable thresholds for diagnosing sperm defects and guiding research into their causes.

Keywords:
fertile menhuman semeninfertility diagnosismultiple anomalies indexreference valuessperm defectsstandardization

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Area of Science:

  • Reproductive biology
  • Andrology
  • Spermatozoa morphology

Background:

  • Genetic and environmental factors influence sperm defects.
  • Lack of standardized phenotyping hinders diagnosis and research consistency.
  • No established baseline data exists for sperm morphology abnormalities.

Purpose of the Study:

  • To determine if standardized assessment of abnormal human sperm morphology offers additional diagnostic information.
  • To identify men with more severe disturbances in specific types of sperm abnormalities.

Main Methods:

  • Utilized a standardized classification method for analyzing Shorr-stained sperm slides.
  • Studied cross-sectional data from fertile men (n=926), infertile men (n=1747), and testicular cancer patients (n=239).
  • Collected detailed sperm abnormality datasets over a 5-year period.

Main Results:

  • Sperm defects were significantly more frequent in infertile men compared to fertile men.
  • Certain head abnormalities were more prevalent in testicular cancer patients than in infertile men.
  • Proposed three levels (low, intermediate, high) for classifying abnormality frequencies based on established percentiles in fertile and infertile men.

Conclusions:

  • Definition-based categorization of sperm defects provides useful thresholds for diagnosis and research.
  • Standardized assessment is recommended for initial andrological check-ups and research studies.
  • Findings offer baseline data for future studies on genetic and environmental factors influencing sperm morphology.