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Related Concept Videos

Skeletal Muscle Anatomy00:55

Skeletal Muscle Anatomy

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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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Classification of Skeletal Muscle Fibers01:48

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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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Fascicle Arrangement in Skeletal Muscles01:25

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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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Gross Anatomy of Skeletal Muscles01:12

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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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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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Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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Related Experiment Video

Updated: Mar 18, 2026

Three-Dimensional Shape Modeling and Analysis of Brain Structures
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Sex Differences in Three-Dimensional Muscle Shape: Disentangling Allometry From Sexual Dimorphism Using Statistical

Jun Umehara1,2, Masashi Taniguchi2, Masahide Yagi1,2

  • 1Faculty of Rehabilitation, Kansai Medical University, Hirakata, Japan.

Scandinavian Journal of Medicine & Science in Sports
|March 17, 2026
PubMed
Summary

This study used statistical shape modeling to analyze human quadriceps femoris muscles. While most sex differences in muscle shape are due to size (allometry), distinct intrinsic shape variations between males and females were identified.

Keywords:
allometrybiomechanicsmorphologysexual dimorphismstatistical shape model

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Skeletal Muscle Gender Dimorphism from Proteomics
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Area of Science:

  • Human anatomy
  • Biomechanics
  • Morphometrics

Background:

  • Sexual dimorphism is observed in skeletal muscle size and shape.
  • Disentangling allometric effects from sexual dimorphism is crucial for understanding sex-related shape differences in human muscles, but remains underexplored.

Purpose of the Study:

  • To identify sex differences in the shape of the human quadriceps femoris muscle.
  • To utilize statistical shape modeling for a novel approach to muscle morphology analysis.
  • To differentiate between size-driven (allometric) and intrinsic shape variations between sexes.

Main Methods:

  • Acquisition of magnetic resonance images from 43 healthy young adults (22 males, 21 females).
  • Measurement of muscle size (volume, cross-sectional area, length, width, thickness) for the four quadriceps femoris heads.
  • Development of statistical shape models to quantify muscle shape variation and perform sex classification via linear discrimination.

Main Results:

  • Males exhibited significantly greater muscle volume, cross-sectional area, length, width, and thickness compared to females.
  • Statistical shape models revealed sex-related shape differences, with some distinct variations preserved after accounting for muscle volume (allometry).
  • Specific regions in the vastus lateralis and vastus medialis showed unique sex-related shape differences, enabling accurate sex classification.

Conclusions:

  • Most observed sex differences in quadriceps femoris shape are attributed to overall size differences (allometry).
  • Intrinsic, size-independent shape differences between male and female quadriceps femoris muscles exist.
  • Statistical shape modeling is a valuable tool for distinguishing allometric effects from true sexual dimorphism in muscle morphology.