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Updated: Apr 27, 2026

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Synergistic yet different: Rethinking the gastrocnemii as two functionally distinct muscles.

Jeroen Aeles1, François Hug2

  • 1Movement and Nutrition for Health and Performance, Vrije Universiteit Brussel, Belgium; Functional Morphology Laboratory, University of Antwerp, Belgium.

Journal of Biomechanics
|April 25, 2026
PubMed
Summary
This summary is machine-generated.

The medial and lateral gastrocnemius muscles, crucial for gait and balance, exhibit distinct anatomical, neural, and biomechanical differences. Recognizing them as separate muscles enhances understanding of their unique roles in human movement.

Keywords:
AnatomyElectromyographyFunctionGastrocnemiusUltrasound

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Area of Science:

  • Biomechanics
  • Human Anatomy
  • Neuroscience

Background:

  • The medial and lateral gastrocnemius muscles are vital for locomotion and posture.
  • They are often treated as a single muscle unit due to shared functions, overlooking potential differences.

Purpose of the Study:

  • To review and synthesize evidence differentiating the medial and lateral gastrocnemius muscles.
  • To highlight the importance of considering these muscles as distinct entities in research.

Main Methods:

  • Re-analysis of previously published data.
  • Review of anatomical, neural, and biomechanical evidence.

Main Results:

  • Medial and lateral gastrocnemius muscles possess partially independent distal sub-tendons, varying volumes, and architectures.
  • Independent neural control suggests distinct neural drives.
  • Significant differences in biomechanical behavior, including force production and potential frontal plane torque generation.

Conclusions:

  • The medial and lateral gastrocnemius muscles exhibit meaningful differences, supporting their classification as distinct muscles.
  • Treating them separately is crucial for accurate biomechanical and modeling studies.
  • Understanding these distinctions can improve insights into human movement and sports performance.