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Related Concept Videos

Spermatogenesis01:41

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...
Spermatogenesis01:22

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...
Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Oogenesis01:22

Oogenesis

Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...
Sperm Transport01:15

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...
Meiosis I01:49

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...

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Related Experiment Video

Updated: May 19, 2026

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes
10:30

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

Published on: January 20, 2014

Spermatogenesis.

Diana S Chu1, Diane C Shakes

  • 1Department of Biology, San Francisco State University, San Francisco, CA, USA. chud@sfsu.edu

Advances in Experimental Medicine and Biology
|August 9, 2012
PubMed
Summary
This summary is machine-generated.

Sperm formation in Caenorhabditis elegans involves complex gene regulation, chromatin remodeling, and unique meiotic processes. This review details the molecular mechanisms driving sperm differentiation and their implications for embryogenesis.

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

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Related Experiment Videos

Last Updated: May 19, 2026

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes
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Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes

Published on: January 20, 2014

Whole-Mount Fluorescence In Situ Hybridization to Study Spermatogenesis in the Anopheles Mosquito
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Whole-Mount Fluorescence In Situ Hybridization to Study Spermatogenesis in the Anopheles Mosquito

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A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
09:40

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

Published on: February 6, 2018

Area of Science:

  • Developmental Biology
  • Genetics
  • Cell Biology

Background:

  • Spermatogenesis is crucial for paternal DNA delivery.
  • Germ cells undergo meiosis and distinct differentiation.
  • Sperm and oocytes have unique developmental pathways.

Purpose of the Study:

  • To review current understanding of sperm formation and differentiation mechanisms in Caenorhabditis elegans.
  • To highlight conserved and divergent aspects of spermatogenesis across organisms.
  • To explore gene regulation, chromatin dynamics, and meiotic progression in C. elegans sperm.

Main Methods:

  • Molecular approaches
  • Transcriptomic analyses
  • Cell biological studies

Main Results:

  • Gene regulation via genomic organization, small RNAs, and transcriptional activators.
  • Systematic chromatin remodeling for differentiation and DNA packaging.
  • Distinct meiotic progression, including karyosome formation and centrosomal chromosome segregation.
  • Assembly of sperm-specific organelles and preparation for activation and motility.
  • Sperm contribute DNA and cellular factors essential for embryogenesis.

Conclusions:

  • C. elegans provides a model for understanding conserved and unique aspects of sperm differentiation.
  • Sperm formation involves intricate genetic and epigenetic regulation.
  • Sperm contribute not only DNA but also vital factors for embryonic development.