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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

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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...
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Testes: Histology01:27

Testes: Histology

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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.
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Sperm Transport01:15

Sperm Transport

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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...
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Microtubule Formation01:23

Microtubule Formation

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Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Related Experiment Video

Updated: Nov 17, 2025

A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
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Mathematical Modeling of Dynamic Cellular Association Patterns in Seminiferous Tubules.

Mari Kawamura1, Kei Sugihara2, Hisako Takigawa-Imamura2

  • 1Academic Society of Mathematical Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan.

Bulletin of Mathematical Biology
|February 17, 2021
PubMed
Summary

Mathematical modeling revealed that differences in human and mouse seminiferous tubule patterns are due to boundary conditions and geometry. This study explains the helical and vertical patterns observed during spermatogenesis.

Keywords:
Cellular association patternReaction–diffusionSeminiferous tubulesWavetrain

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Area of Science:

  • Reproductive Biology
  • Mathematical Biology
  • Developmental Biology

Background:

  • Sperm production occurs in seminiferous tubules, exhibiting dynamic spatiotemporal wavetrain patterns.
  • Two main patterns exist: vertical (mice) and helical (humans), with underlying mechanisms poorly understood.

Purpose of the Study:

  • To model and understand the mechanisms behind the different wavetrain patterns in mouse and human seminiferous tubules.
  • To investigate the role of boundary conditions and geometry in pattern formation during spermatogenesis.

Main Methods:

  • Utilized a three-species reaction-diffusion model for numerical simulations.
  • Compared pattern frequencies and wavelengths between human and mouse models.
  • Analyzed histological sections of human tubules to validate theoretical predictions.

Main Results:

  • Successfully reproduced observed wavetrain patterns using the reaction-diffusion model.
  • Identified complex helical and vertical pattern frequencies explainable by boundary conditions.
  • Predicted and subsequently confirmed the presence of vertical patterns in human seminiferous tubules.
  • Demonstrated that irregular geometry and wider unstable wavenumber ranges contribute to human pattern irregularity.

Conclusions:

  • Mathematical modeling effectively explains the dynamic pattern formation in seminiferous tubules.
  • Boundary conditions and geometric factors are crucial in determining species-specific spermatogenesis patterns.
  • The study reconciles theoretical predictions with empirical observations in human and mouse reproductive biology.