Bilateral Three-headed Biceps Brachii Muscle and its Clinical Implications

Area of Science:

• Anatomy
• Morphology
• Human Anatomy

Background:

• The biceps brachii muscle often displays anatomical variations.
• The three-headed biceps brachii is a commonly cited variation.

Observation:

• A unique bilateral case of tricipital biceps brachii was discovered during cadaveric dissection.
• The third head of the biceps brachii originated from the deep investing fascia of the brachialis muscle on both sides.

Findings:

• The musculocutaneous nerve exhibited an aberrant course on the right side, bypassing the coracobrachialis muscle.
• The musculocutaneous nerve on the right side terminated by supplying the anterior arm muscles, while the left side showed a typical course.

Implications:

• Understanding these rare anatomical variations is vital for accurate preoperative diagnosis.
• Awareness of variant biceps brachii and musculocutaneous nerve patterns can help prevent iatrogenic injuries during upper limb procedures.