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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 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...

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...

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...

SNAREs and Membrane Fusion

SNAREs and Membrane Fusion

Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...

Fusion of Secretory Vesicles with the Plasma Membrane

Fusion of Secretory Vesicles with the Plasma Membrane

Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...

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Related Experiment Video

Updated: Jul 3, 2026

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 head membrane reorganisation during capacitation.

Bart M Gadella¹, Pei-Shiue Tsai, Arjen Boerke

¹Department of Biochemistry and Cell Biology and of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands. B.M.Gadella@uu.nl

The International Journal of Developmental Biology

|July 24, 2008

Summary

Sperm membrane domains are crucial for fertilization. This review explores how lipid rafts in sperm membranes influence zona binding and the acrosome reaction, key events in fertilization.

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Measuring Intracellular Ca2+ Changes in Human Sperm using Four Techniques: Conventional Fluorometry, Stopped Flow Fluorometry, Flow Cytometry and Single Cell Imaging

Measuring Intracellular Ca²⁺ Changes in Human Sperm using Four Techniques: Conventional Fluorometry, Stopped Flow Fluorometry, Flow Cytometry and Single Cell Imaging

Published on: May 24, 2013

Fluorimetric Techniques for the Assessment of Sperm Membranes

Fluorimetric Techniques for the Assessment of Sperm Membranes

Published on: November 28, 2018

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Last Updated: Jul 3, 2026

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

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Published on: January 22, 2020

Measuring Intracellular Ca2+ Changes in Human Sperm using Four Techniques: Conventional Fluorometry, Stopped Flow Fluorometry, Flow Cytometry and Single Cell Imaging

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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
Cell biology
Membrane biophysics

Background:

Sperm cells exhibit polarized morphology with distinct membrane domains.
Specialized regions on the sperm head mediate zona pellucida binding, acrosome reaction, and egg fusion.
Lipid rafts, ordered membrane microdomains, have been identified in sperm.

Purpose of the Study:

To review recent findings on sperm lipid raft research.
To discuss the role of sperm lipid raft dynamics in fertilization processes.

Main Methods:

Literature review of current research on sperm lipid rafts.
Analysis of studies investigating sperm-zona binding and acrosome reaction.

Main Results:

Sperm membrane organization is heterogeneous and changes during capacitation.
Specific sperm surface regions are functionally specialized for fertilization events.
Lipid rafts are implicated in sperm-zona binding and the acrosome reaction.

Conclusions:

Sperm lipid raft dynamics are critical for successful fertilization.
Further research into lipid rafts will illuminate sperm function and potential fertility treatments.