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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...

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...

Sperm Transport

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The maturation phase occurs in the epididymis, where sperm...

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Related Experiment Video

Updated: Apr 30, 2026

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

Published on: November 29, 2018

Sperm retrieval and quality evaluation.

Peter J Stahl¹, Peter N Schlegel, Marc Goldstein

¹Department of Urology, Columbia University Medical Cente, 161 Fort Washington Ave 11th floor, New York, NY, 10032, USA.

Methods in Molecular Biology (Clifton, N.J.)

|May 1, 2014

Summary

This summary is machine-generated.

Sperm retrieval techniques and advanced reproductive technologies (ART) now offer biological paternity for men with azoospermia. An interdisciplinary approach is crucial for successful sperm acquisition and optimal reproductive outcomes in these previously untreatable cases.

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Last Updated: Apr 30, 2026

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

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Published on: November 29, 2018

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Published on: July 28, 2018

Area of Science:

Reproductive Medicine and Urology
Andrology and Assisted Reproduction

Background:

Azoospermia was historically untreatable, preventing biological paternity.
Recent advancements in sperm retrieval and ART have changed this landscape.
Surgically retrieved sperm now offers a viable option for azoospermic men.

Purpose of the Study:

To discuss critical steps in sperm acquisition for azoospermic patients.
To highlight the importance of an interdisciplinary approach in male subfertility.
To detail the process of achieving optimal reproductive outcomes using surgically retrieved sperm.

Main Methods:

Technical refinements in surgical sperm retrieval methods.
Application of advanced reproductive technologies (ART) with retrieved sperm.
Characterization and isolation of sperm from surgically retrieved specimens by laboratory personnel.

Main Results:

Enabled biological paternity in men with azoospermia previously considered untreatable.
Demonstrated the benefit of a multistep, interdisciplinary process for sperm acquisition.
Improved reproductive outcomes through specialized male subfertility care.

Conclusions:

Modern sperm retrieval techniques and ART have revolutionized azoospermia treatment.
A collaborative, interdisciplinary approach involving reproductive endocrinologists, urologists, and lab experts is essential.
Successful sperm acquisition and utilization lead to achievable biological paternity for azoospermic men.