Pectoral Region Muscles: Origin, Insertion, Innervation and Action
Winged scapula
Scapular serratus not functioning, possibly Long Thoracic nerve damage
Lateral Pectoral nerve innervates
Pectoralis Major Innervation
Axilla Space borders
Anterior wall: pec major and minor Posterior wall: subscapularis, latissimus dorsi and teres major Medial wall: serratus anterior Lateral wall: intertubercular groove of humerus
Axilla Space contents
Axillary artery and vein Cords of the brachial plexus SH/LH of biceps and coracobrachialis Long thoracic nerve
Subclavius Origin and Insertion
Origin: Rib 1 Insertion: Inferior aspect of clavicle (under the "s")
Serratus Anterior Origin and Insertion
Origin: Ribs 1-8 Insertion: Medial border of the scapula
Pectoralis Minor Origin and Insertion
Origin: Ribs 3-5 Insertion: Coracoid Process of Scapula
Pectoralis Major origin and Insertion
Origin: Clavicular Head Sternocostal Head Abdominal Head Insertion: Lateral aspect of Intertubercular groove of Humerus
Flexion and Extension Horizontal Adduction and Internal Rotation
Pectoralis Major Action
Medial Pectoral nerve innervates both
Pectoralis Major and Pectoralis Minor Innervation
Assists with scap protraction and Downward rotation of Scapula
Pectoralis Minor Action
Pectoralis Minor when tight
Pulls on scapula (coracoid process) causing an anterior tilt - can be rectified by stretching and manual therapy to loosed muscle and train retraction of shoulders
Upward rotation of scapula (in synergy with trap) and Protraction
Serratus Anterior Action
Long thoracic nerve innervates
Serratus Anterior Innervation
Clavicular stability
Subclavius Action
Nerve to the subclavius innervates
Subclavius Innervation