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Related Concept Videos

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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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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
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The connective tissues play a significant role in arranging the muscle fibers into a hierarchical structure that forms a complete muscle. Consider a muscle like the bicep brachii, commonly called the bicep. This muscle comprises thousands of muscle fibers enclosed by a protective layer of connective tissue called the endomysium. The endomysium is primarily composed of reticular fibers, a type of thin collagen fiber. It allows the exchange of nutrients and waste products at the fiber level,...
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The human body has three types of muscle tissue: skeletal, smooth, and cardiac. Each class has unique properties that enable them to perform specific functions. However, all muscle tissues share certain properties, including elasticity, contractility, and excitability. 
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Related Experiment Video

Updated: Jan 2, 2026

Author Spotlight: Integrating Mechanical and Biological Analysis in Tendinopathy Research
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Author Spotlight: Integrating Mechanical and Biological Analysis in Tendinopathy Research

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How to visualize the innervation pattern in tendons: A methodical guide.

Roland Blumer1, Sandra Boesmueller2, Bernhard Gesslbauer3

  • 1Center of Anatomy and Cell Biology, MIC, Medical University Vienna, A-1090 Vienna, Austria.

Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft
|June 14, 2019
PubMed
Summary

This study introduces a new method for visualizing tendon innervation using immunofluorescence and confocal microscopy. This technique allows for detailed, multicolor imaging of nerve fibers in tendons, improving the understanding of chronic tendon pain.

Keywords:
ImmunofluorescenceImmunohistochemistryInnervationTendon

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Area of Science:

  • Orthopedics
  • Neuroscience
  • Histology

Background:

  • Tendon pathologies are common, with growing evidence implicating the peripheral nervous system.
  • Immunohistochemistry (IHC) is crucial for studying nerve involvement in chronic tendon pain.
  • Traditional formalin-fixed, paraffin-embedded (FFPE) methods have limitations, including antigen masking and difficulties with multiplexing.

Purpose of the Study:

  • To present an alternative immunohistochemical approach for visualizing tendon innervation.
  • To address the limitations of FFPE specimens in tendon research.

Main Methods:

  • A novel method combining paraformaldehyde fixation, cryo-embedding, immunofluorescence, and confocal laser scanning microscopy.
  • Utilized neuronal markers like neurofilament, protein gene product 9.5, calcitonin gene-related peptide, and substance P.
  • Merged fluorescence and bright-field images for comprehensive mapping.

Main Results:

  • Successfully visualized tendon innervation in the long head of the biceps tendon.
  • Acquired high-quality, multicolor images of tendon nerve fiber patterns.
  • Demonstrated the feasibility of simultaneous multi-marker labeling on a single tissue section.

Conclusions:

  • The developed approach offers a valuable research tool for the orthopedic community.
  • Enables more accurate definition of tendon innervation heterogeneity.
  • Facilitates simultaneous analysis of multiple neuronal markers in tendon tissues.