The Study
Four-Headed Biceps Brachii Muscle, with a Rare Pectoralis Major Supernumerary Head: A Cadaveric Case Report
This study is like finding a weird-looking tree in a forest and taking a picture of it. It shows something unusual exists, but it doesn’t tell us how common it is, why it happened, or if it affects how the tree grows or lives.
Analysis score
Maximum 30 for a case report.
Where the score came from
Doctors found a rare extra part of a muscle in someone's arm that most people don’t have. It was found while studying a body after death.
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 520 / 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.
- 1This finding helps doctors understand unusual arm symptoms and avoid mistakes during surgery.
- 21 person had a four-headed biceps muscle with a rare extra piece from the chest muscle.
- 3This has never been described in detail before.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Related Content
Claims (3)
Someone was found to have a rare extra-headed bicep muscle in just one arm — something never seen before — during a regular anatomy class dissection.
Knowing how the biceps muscle can vary from person to person helps doctors spot nerve or blood vessel problems and avoid mistakes during arm surgery.
Sometimes people have extra muscle parts in their upper arm, and that can squeeze nerves or blood vessels or change how nerves are shaped — this might make surgeries or diagnosing arm problems trickier.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.