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Sperm Structure and Semen Composition

Sperm Structure and Semen Composition

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...

Sperm Transport

Sperm Transport

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...

Testes: Histology

Testes: Histology

A tough, fibrous membrane, the tunica albuginea, covers the testes, extending inward to form fibrous partitions or septa, dividing them into internal compartments called lobules. Each lobule has 1 to 3 tightly coiled seminiferous tubules where sperm production occurs. These tubules merge into a tubular network at the back of the testis, known as the rete testis. It connects to 15 to 20 efferent ductules, leading to the epididymis.
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Spermatogenesis

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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 reproductive...

Accessory Glands of the Male Reproductive System

Accessory Glands of the Male Reproductive System

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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Related Experiment Video

Updated: Jun 16, 2026

The Examination of Peroxidase-Positive Leukocytes in Semen

The Examination of Peroxidase-Positive Leukocytes in Semen

Published on: January 19, 2024

Practical semen analysis: from A to Z.

Charlene Brazil¹

¹Center for Health and the Environment, University of California, Davis, 95616, USA. cbrazil@ucdavis.edu

Asian Journal of Andrology

|January 30, 2010

Summary

Standardizing semen analysis is crucial for accurate patient care and research. Implementing World Health Organization (WHO) guidelines with enhanced training and quality control is essential for reliable results.

Area of Science:

Andrology
Reproductive Medicine
Clinical Laboratory Science

Background:

Accurate semen analysis is vital for patient care, fertility studies, and toxicant exposure research.
Current semen analysis methods face challenges due to subjective techniques, inadequate training, and inconsistent proficiency testing.
The World Health Organization (WHO) Semen handbook (2010) provides standardized procedures but has limitations in conveying techniques effectively.

Purpose of the Study:

To highlight the critical need for standardization in semen analysis.
To propose enhancements to the WHO guidelines for improved accuracy and consistency.
To emphasize the importance of rigorous quality control in laboratory practices.

Main Methods:

Review of existing semen analysis standardization challenges.

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Last Updated: Jun 16, 2026

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Discussion of the limitations of the WHO Semen handbook (2010).

Proposal for supplementary educational tools like DVDs for technique demonstration.

Main Results:

Standardization of semen analysis remains a significant challenge.
Existing guidelines require further enhancement through practical demonstrations and robust quality assurance.
Adherence to standardized techniques is often lacking, compromising result validity.

Conclusions:

Enhanced training and quality control are imperative for accurate semen analysis.
The effectiveness of WHO guidelines can be improved with supplementary visual aids and consistent implementation.
Without improvements, patient results and inter-laboratory comparisons will remain unreliable.