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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.
The four primary types of muscle based on fascicle arrangement are:
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Tracking Morphogenetic Tissue Deformations in the Early Chick Embryo
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Quantifying muscle architecture in embryos using diceCT and algorithmic fascicle tracking.

Julia L Molnar1, Cassidy E Davis2, Akinobu Watanabe1,3,4

  • 1New York Institute of Technology, College of Osteopathic Medicine, Old Westbury, New York, USA.

Anatomical Record (Hoboken, N.J. : 2007)
|July 18, 2025
PubMed
Summary
This summary is machine-generated.

This study successfully adapted fascicle tracking algorithms for embryonic chick jaw muscles, enabling high-fidelity in situ measurements of muscle function from early development. This opens new avenues for studying muscle development and its impact on skeletal growth.

Keywords:
diceCTembryologyfasciclejaw musclemuscle architecture

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Area of Science:

  • Developmental Biology
  • Biomechanics
  • Anatomy

Background:

  • Soft-tissue imaging and muscle reconstruction tools allow myological property extraction.
  • Semi-autonomous fascicle tracking algorithms enable in situ measurements of muscle fiber length and orientation.
  • Previous applications focused on postnatal vertebrate specimens, not embryonic ones.

Purpose of the Study:

  • To demonstrate the efficacy of fascicle tracking algorithms on embryonic specimens.
  • To enable in situ recording of life history changes in muscle action and function from the onset of contraction.
  • To investigate form-function relationships in embryonic muscle development.

Main Methods:

  • Implementation of a semi-automated fascicle tracking tool on embryonic chick (Gallus gallus domesticus) jaw muscles.
  • Comparison of algorithmic and manual fascicle reconstructions for visual and quantitative validation.
  • Analysis of fascicle orientation and physiological cross-sectional areas in embryonic jaw muscles.

Main Results:

  • The fascicle tracking tool was successfully extended to embryonic specimens.
  • Embryonic jaw muscles showed less uniform orientation and smaller cross-sectional areas compared to adults.
  • An artifact was noted where fascicle lengths appeared shorter in smaller muscles, though orientations remained congruent with manual segmentation.

Conclusions:

  • Existing semi-automated fascicle tracking tools are extensible to embryonic specimens.
  • This approach allows high-fidelity investigation of muscle function from early developmental stages.
  • The findings provide insights into how feeding requirements influence muscle growth trajectories and form-function relationships.