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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...

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...

Male Sexual Response: Erection & Ejaculation

Male Sexual Response: Erection & Ejaculation

Sexual stimulation can take various forms, such as physical touch and visual or auditory cues. When this happens, the parasympathetic reflex in the sacral portion of the spinal cord is activated. This reflex stimulates the release of nitric oxide (NO), which then dilates the arterioles in the penis, increasing blood flow to the erectile tissues - the corpora cavernosa and corpus spongiosum.
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...

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Related Experiment Video

Updated: May 29, 2026

Phosphopeptide Analysis of Rodent Epididymal Spermatozoa

Phosphopeptide Analysis of Rodent Epididymal Spermatozoa

Published on: December 30, 2014

Spermiation: The process of sperm release.

Liza O'Donnell¹, Peter K Nicholls, Moira K O'Bryan

¹Prince Henry's Institute of Medical Research; Clayton, VIC Australia.

Spermatogenesis

|August 26, 2011

Summary

Spermiation, the release of mature sperm from Sertoli cells, involves complex cellular machinery. Understanding this process is key to addressing male infertility and developing new contraceptives.

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Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm

Medium-throughput Screening Assays for Assessment of Effects on Ca²⁺-Signaling and Acrosome Reaction in Human Sperm

Published on: March 1, 2019

Analysis of Epididymal Protein Synthesis and Secretion

Analysis of Epididymal Protein Synthesis and Secretion

Published on: August 25, 2018

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Last Updated: May 29, 2026

Phosphopeptide Analysis of Rodent Epididymal Spermatozoa

Phosphopeptide Analysis of Rodent Epididymal Spermatozoa

Published on: December 30, 2014

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm

Medium-throughput Screening Assays for Assessment of Effects on Ca²⁺-Signaling and Acrosome Reaction in Human Sperm

Published on: March 1, 2019

Analysis of Epididymal Protein Synthesis and Secretion

Analysis of Epididymal Protein Synthesis and Secretion

Published on: August 25, 2018

Area of Science:

Reproductive Biology
Cell Biology
Spermatogenesis

Background:

Spermiation is the final step in sperm development, releasing mature spermatids from Sertoli cells.
This process occurs at the seminiferous epithelium's apical edge over several days.

Purpose of the Study:

To review the morphological, ultrastructural, and functional aspects of mammalian spermiation.
To examine the molecular composition, dynamics, and regulation of the spermiation machinery.
To assess causes of spermiation failure and its impact on sperm quality and male fertility.

Main Methods:

Morphological and ultrastructural analysis of spermiation.
Examination of molecular components and regulatory factors.
Assessment of clinical data related to spermiation failure.

Main Results:

Spermiation involves intricate remodeling, adhesion removal, and disengagement of spermatids.
The "spermiation machinery" comprises coordinated cellular structures and processes.
Spermiation failure impacts sperm morphology, function, and male fertility.

Conclusions:

Spermiation is a critical, multi-step process essential for male fertility.
Dysregulation of spermiation contributes to infertility and may be a target for male contraception.