Spry Juncture, LLC
How to Evolve Gracefully
Biceps Brachii
Region
Origin & Insertion
['Origin: Short head: coracoid process; Long head: supraglenoid tubercle of scapula', 'Insertion: Radial tuberosity and bicipital aponeurosis']
Synergistic Muscles
['Brachialis', 'Brachioradialis']
Joints
['Shoulder', 'Elbow', 'Proximal radioulnar joint']
Primary Actions
['Elbow flexion', 'Forearm supination', 'Shoulder flexion']
Nerve & Spinal Segment
Musculocutaneous nerve
Brachial plexus; C5–C6
Interesting
Most active during rapid elbow flexion with supination. [Clinically Oriented Anatomy]
Reversal of Action
Bring torso toward forearm (e.g. chin-up)
Common Dysfunctions
Weak elbow flexion and supination, shoulder instability
How to Stretch
Extend elbow, shoulder, and pronate forearm.
Trigger Points
How to Strengthen
Curls with supination.
Concentric Action
Flex elbow with palm up (bicep curl)
Applications:
Used in lifting, feeding, ADLs; critical in elbow rehab
Eccentric Action
Lower dumbbell from curl slowly
Isotonic Action
Bicep curls with dumbbells or band
Related Conditions
['Biceps rupture', 'Shoulder instability']
Isometric Action
Hold elbow at 90° flexion with load
Exercise Ideas
['Supinated curls', 'Preacher curl', 'Chin-up']