A Rare Extra Head on the Arm Muscle
Four-Headed Biceps Brachii Muscle, with a Rare Pectoralis Major Supernumerary Head: A Cadaveric Case Report
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
A single person had a four-headed biceps muscle with a rare pectoral head attachment — a combination never before detailed in medical literature.
While accessory heads of the biceps are occasionally reported, the co-occurrence of both an accessory humeral head and a supernumerary pectoral head in a unilateral configuration is extremely rare and had not been formally documented until now.
Practical Takeaways
Medical professionals should consider anatomical variation as a possible cause when patients present with unexplained upper limb pain or nerve symptoms.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
A single person had a four-headed biceps muscle with a rare pectoral head attachment — a combination never before detailed in medical literature.
While accessory heads of the biceps are occasionally reported, the co-occurrence of both an accessory humeral head and a supernumerary pectoral head in a unilateral configuration is extremely rare and had not been formally documented until now.
Practical Takeaways
Medical professionals should consider anatomical variation as a possible cause when patients present with unexplained upper limb pain or nerve symptoms.
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.