What does the chest muscle look like inside?
Three‐dimensional study of pectoralis major muscle and tendon architecture
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
No twisting was observed in the pectoralis major muscle or tendon.
Many assume large muscles like the pectoralis have complex, twisted architectures like the gastrocnemius or other biarticular muscles. The absence of any twist contradicts intuitive models of muscle design.
Practical Takeaways
Surgeons may use the two-layer tendon structure and lack of twist to guide more anatomically accurate repairs after pectoral tears.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
No twisting was observed in the pectoralis major muscle or tendon.
Many assume large muscles like the pectoralis have complex, twisted architectures like the gastrocnemius or other biarticular muscles. The absence of any twist contradicts intuitive models of muscle design.
Practical Takeaways
Surgeons may use the two-layer tendon structure and lack of twist to guide more anatomically accurate repairs after pectoral tears.
Publication
Journal
Clinical Anatomy
Year
2009
Authors
Lillia Y. Fung, B. Wong, K. Ravichandiran, A. Agur, Tim Rindlisbacher, A. Elmaraghy
Related Content
Claims (6)
In dead bodies, the chest muscle doesn't twist, which might make it easier for surgeons to rebuild it during operations.
In dead bodies, the big chest muscle's tendon has two layers—one in front and one in back. The front layer is longer, and they join together at the bottom, which might affect how the tendon works and how well it heals after injury.
The chest muscle in dead bodies has a top part that's smooth and a bottom part made of 6 to 7 separate chunks, where the lowest chunk wraps around the one above it like a cradle — this unique shape might change how the muscle works and how doctors fix it in surgery.
The chest muscle has different parts with different fiber lengths — in one part, fibers get longer from top to bottom, and in another part, the middle fibers are the longest, which might mean they work differently when you move.
The upper part of your chest muscle has fibers that are angled more than the lower part, which might mean they pull in slightly different ways and work differently when you move.