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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

Spermatogenesis

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...

Spermatogenesis

Spermatogenesis

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.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...

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...

Centrioles and Centrosomes

Centrioles and Centrosomes

Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or "prometaphase,"...

Centrosome Duplication

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...

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Related Experiment Video

Updated: Jun 27, 2026

A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model

A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model

Published on: February 6, 2018

Human Sperm Centrosome: From Current Evidence to Future Perspectives-A Systematic Review.

Alessandra Parrella¹, Llanos Medrano¹, Jon Aizpurua²

¹IVF Life, Reproductive Medicine, 03540 Alicante, Spain.

Life (Basel, Switzerland)

|June 26, 2026

Summary

The sperm centrosome is vital for early embryonic development. Its integrity and associated proteins are crucial for successful fertilization and preventing embryonic abnormalities.

Keywords:

centrosome human human spermatozoa infertility

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Imaging Centrosomes in Fly Testes

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Last Updated: Jun 27, 2026

A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model

A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model

Published on: February 6, 2018

Imaging Centrosomes in Fly Testes

Imaging Centrosomes in Fly Testes

Published on: September 20, 2013

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

Published on: November 29, 2018

Area of Science:

Reproductive biology and developmental science.
Cell biology and molecular genetics.

Background:

The sperm centrosome, comprising centrioles and pericentriolar material, is essential for initiating cell division in early embryos.
It plays a critical role in forming the sperm aster and the first mitotic spindle post-fertilization.

Purpose of the Study:

To provide an updated overview of the human sperm centrosome.
To examine its structure, protein composition, and role in reproductive success.
To investigate its association with embryonic abnormalities.

Main Methods:

A systematic review of 83 publications.
Publications reviewed span from 1986 to 2026.
Focus on structural organization, protein composition, reproductive role, and embryonic abnormalities.

Main Results:

Key centrosome proteins (centrin, γ-tubulin, pericentrin) are vital for spindle assembly and microtubule nucleation.
Altered protein expression/localization correlates with poor sperm quality and reduced fertilization.
Centrosomal dysfunction is linked to fertilization failure, abnormal embryo cleavage, and potential aneuploidy.

Conclusions:

Sperm centrosomal integrity is clinically relevant for reproductive outcomes.
Further research is needed for improved diagnostics and targeted therapies.
Understanding centrosome function is critical for addressing infertility and developmental issues.