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Related Concept Videos

Overview of Skeletal Muscle01:15

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Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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Microscopic Anatomy of Skeletal Muscles01:13

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Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
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A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
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Skeletal Muscle Anatomy00:55

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Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Updated: Aug 1, 2025

Assessing Functional Metrics of Skeletal Muscle Health in Human Skeletal Muscle Microtissues
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Structure-Function relationships in the skeletal muscle extracellular matrix.

Richard L Lieber1, Gretchen Meyer2

  • 1Shirley Ryan AbilityLab, Departments of Physical Medicine and Rehabilitation, Physiology and Biomedical Engineering, Northwestern University, Chicago, IL, and Hines VA Medical Center, Maywood IL, United States.

Journal of Biomechanics
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Summary

Skeletal muscle

Keywords:
Comparative biomechanicsMuscle mechanicsPassive stiffnessTitin

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Area of Science:

  • Biomechanics
  • Skeletal Muscle Physiology
  • Extracellular Matrix Biology

Background:

  • Most skeletal muscle biomechanical research prioritizes active contractile properties.
  • Passive biomechanical properties are crucial in aging and disease but poorly understood.
  • The extracellular matrix (ECM) significantly influences passive muscle mechanics.

Purpose of the Study:

  • To review the passive biomechanical properties of the skeletal muscle ECM.
  • To explore the structural basis of these passive properties.
  • To identify challenges in current analytical approaches and suggest future experimental directions.

Main Methods:

  • Literature review focusing on passive skeletal muscle biomechanics and ECM structure.
  • Analysis of common analytical methods for determining passive properties.
  • Discussion of structural components like perimysial cables and collagen cross-links.

Main Results:

  • The interplay between ECM structures (e.g., perimysial cables) and passive biomechanical properties remains unclear.
  • Standardized analytical approaches for passive properties are lacking, with variations in stress-strain data fitting and zero-strain definitions.
  • Optimal measurement ranges for passive mechanical properties are not well-defined.

Conclusions:

  • Further research is needed to elucidate the structure-function relationship of the muscle ECM in passive mechanics.
  • Standardization of analytical methods is essential for reliable assessment of passive muscle properties.
  • Experimental approaches should be refined to accurately measure both structural and functional aspects of skeletal muscle.