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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...

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...

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...

Infertility in Males

Infertility in Males

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...

Fertilization

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the 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.
The spermatogenic cells, responsible for producing sperm, are...

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Related Experiment Video

Updated: Jun 10, 2025

Using an Extracellular Flux Analyzer to Measure Changes in Glycolysis and Oxidative Phosphorylation during Mouse Sperm Capacitation

Using an Extracellular Flux Analyzer to Measure Changes in Glycolysis and Oxidative Phosphorylation during Mouse Sperm Capacitation

Published on: January 22, 2020

Sperm Metabolism.

Giselle Adriana Abruzzese¹, Ana Sanchez-Rodriguez¹, Eduardo R S Roldan¹

¹Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain.

Molecular Reproduction and Development

|October 16, 2024

Summary

Sperm bioenergetics is vital for fertilization and offspring development. Understanding flexible sperm metabolism offers insights into male fertility, livestock, and reproductive technologies.

Keywords:

ATP capacitation fertilization metabolism spermatozoa

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Author Spotlight: Advancing Male Infertility Research by Unraveling Sperm Metabolism and Mitochondrial Function

Author Spotlight: Advancing Male Infertility Research by Unraveling Sperm Metabolism and Mitochondrial Function

Published on: June 23, 2023

Fluorimetric Techniques for the Assessment of Sperm Membranes

Fluorimetric Techniques for the Assessment of Sperm Membranes

Published on: November 28, 2018

Related Experiment Videos

Last Updated: Jun 10, 2025

Using an Extracellular Flux Analyzer to Measure Changes in Glycolysis and Oxidative Phosphorylation during Mouse Sperm Capacitation

Using an Extracellular Flux Analyzer to Measure Changes in Glycolysis and Oxidative Phosphorylation during Mouse Sperm Capacitation

Published on: January 22, 2020

Author Spotlight: Advancing Male Infertility Research by Unraveling Sperm Metabolism and Mitochondrial Function

Author Spotlight: Advancing Male Infertility Research by Unraveling Sperm Metabolism and Mitochondrial Function

Published on: June 23, 2023

Fluorimetric Techniques for the Assessment of Sperm Membranes

Fluorimetric Techniques for the Assessment of Sperm Membranes

Published on: November 28, 2018

Area of Science:

Reproductive Biology
Sperm Physiology
Bioenergetics

Background:

Sperm bioenergetics is critical for fertilization, influencing motility, capacitation, and oocyte interactions.
Sperm metabolism is adaptable, responding to environmental and energetic needs throughout reproduction.
Emerging evidence links sperm metabolic functions to zygote and embryo development, affecting offspring health.

Purpose of the Study:

To review current knowledge on mammalian sperm metabolism.
To highlight species-specific metabolic features and changes during the reproductive journey.
To explore the implications of sperm metabolism in translational research and reproductive biotechnologies.

Main Methods:

Literature review of recent studies on sperm bioenergetics.
Analysis of species-specific metabolic peculiarities.
Discussion of novel assessment tools for sperm metabolism.

Main Results:

Sperm metabolism is dynamic and crucial for various reproductive stages.
Metabolic functions extend beyond fertilization, impacting early embryonic development.
Species-specific differences in sperm metabolism are significant.

Conclusions:

Sperm metabolism is a key factor in male fertility and reproductive success.
Further research into sperm bioenergetics can advance reproductive biotechnologies.
Understanding sperm metabolism is essential for livestock and human fertility research.