Serratus Anterior
Region
Origin & Insertion
['Origin: External surfaces of ribs 1–8', 'Insertion: Anterior surface of medial border of scapula']
Synergistic Muscles
['Trapezius (lower fibers)', 'Pectoralis minor']
Joints
['Scapulothoracic articulation']
Primary Actions
['Protracts scapula', 'Holds scapula against thoracic wall', 'Assists upward rotation']
Nerve & Spinal Segment
Long thoracic nerve
Brachial plexus; C5–C7
Interesting
Known as the “boxer’s muscle.” [Moore’s]
Reversal of Action
Pull rib cage toward scapula (forceful exhale cue)
Common Dysfunctions
Scapular winging, poor overhead reach
How to Stretch
Wall reach with deep scapular protraction.
Trigger Points
How to Strengthen
Push-up plus, wall slides.
Concentric Action
Protract scapula (push-up plus)
Applications:
Vital for scapular stability and shoulder impingement prevention
Eccentric Action
Control scapular retraction during push-up
Isotonic Action
Wall slides, resisted protraction
Related Conditions
['Shoulder impingement', 'Rotator cuff dysfunction']
Isometric Action
Hold scapula protracted during plank
Exercise Ideas
['Wall slides', 'Serratus punches', 'Push-up plus']
Related Blogs
Images
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