The Study
Three‐dimensional study of pectoralis major muscle and tendon architecture
This study looked at 11 dead bodies to see how the chest muscle is built. It can tell us what the muscle looks like, but it can't tell us how it works or what happens if it gets hurt.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Scientists looked at dead bodies' chest muscles to see how they are built. They took pictures and made 3D models to understand the shape and layers.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 526 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes, because knowing the exact shape helps doctors fix torn chest muscles better.
- 2The chest muscle has two parts: one with even fibers and one with 6–7 sections.
- 3The bottom section bends forward to hold the one above.
- 4The tendon has two layers, and there's no twist.
- 5Fibers get longer from top to bottom in the upper part, and are longest in the middle sections of the lower part.
- 6The angle of the fibers is steeper in the upper part (29.4°) than the lower (20.6°).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
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.
The big chest muscle has two parts: one on top with smooth, even fibers, and a lower part made of 6 or 7 separate bundles, where the bottom one folds forward.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.