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Related Experiment Videos

Human cervical mucus and its interaction with sperm: a fine-structural view.

A I Yudin1, F W Hanson, D F Katz

  • 1Department of Obstetrics and Gynecology, School of Medicine, University of California Davis 95616.

Biology of Reproduction
|March 1, 1989
PubMed
Summary

Cervical mucus exhibits a complex macromolecular architecture. Physical forces like sperm movement significantly alter its structure, impacting sperm passage.

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Area of Science:

  • Reproductive Biology
  • Biophysics
  • Materials Science

Background:

  • Cervical mucus, a glycoprotein gel, plays a crucial role in reproduction.
  • Its biological functions are intrinsically linked to its macromolecular architecture.

Purpose of the Study:

  • To investigate the fine structural aspects of cervical mucus.
  • To examine mucus microstructure before and after physical shearing.
  • To observe mucus interaction with spermatozoa.

Main Methods:

  • Transmission electron microscopy (TEM).
  • Freeze-substitution fixation techniques.
  • Unidirectional physical shearing of mucus.

Main Results:

  • Unstretched mucus shows interconnecting electron-dense elements (0.04-0.5 microns) with interstitial spaces (0.5-0.8 microns).

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  • Physical stretching causes alignment, reduced interconnection, or lateral compression of elements, reducing pore size and potentially excluding sperm.
  • Spermatozoa actively deform the mucus microstructure during movement.

    • Conclusions:

    • Cervical mucus possesses a detailed microstructure that is highly sensitive to mechanical forces.
    • The dynamic changes in mucus structure in response to sperm are critical for regulating sperm transport and interaction.