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Pectoralis Major PA (Origin)
Medial 1/2 clavicle along anterior portion, sternum along 1/2 anterior surface, 1- costal cartilage, sternal end of 6th rib & aponeurosis of EAO
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Pectoralis major DA (Insertion)
Lateral lip of bicipital groove
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Pectoralis major Innervation
Medial and lateral pectoral
- Clavicular fibers (C5,6)
- Sternal fibers (C6-T1)
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Pectoralis major Blood Supply
Pectoral a (from thorac-acromial trunk)
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Pectoralis major Actions
- OC- Humeral adduction & medial rotation
- calvicular fibers: flex anextended arm
- sternal fibers: extend a flexed arm
CC- Draws trunk upward & forward
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Pectoralis minor PA (Origin)
Ribs 3-5 along upper margins & outer surfaces near costal cartilage, fascia over adjoining external intercostal mm,
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Pectoralis minor DA (Origin)
Coracoid process along medial border & upper surface
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Pectoralis minor Innervation
Medial and lateral pectoral (C5-T1)
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Pectoralis minor Blood Supply
Pectoral a (from thoraco-acromial trunk)
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Pectoralis minor Actions
Scapular depression (downward rotation & inferior slide), assists with protraction (internal rotation of and lateral slide of the scapula)
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Subclavis PA (Origin)
1st rib at junction of rib and its costal cartiage
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Subclavius DA (Insertion)
Groove on middle 1/3 of cavicle's inferior surface
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Subclavius Innervation
nerve to Subclavius (C5,6)
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Subclavius Blood Supply
Clavicular a. (from thoraco-acromial trunk)
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Subclavius Actions
OC- Shnting (approximating) the clavicle towards the manubrium during violent etremity motions (such as throwing or hitting). Also produces clavicular depression & protraction
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Serratus anterior PA (Origin)
Upper 8 ribs along external surfaces & superior borders & to fascia of adjoining intercostal mm.
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Serratus anterior DA (Insertion)
Scapula along medial border of anterior (volar) surface
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Serratus anterior Innervation
Long thoracic (C5,6,7)
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Serratus anterior Blood Supply
Lateral thoracic a.
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Serratus anterior Actions
Scapular upward rotation, lateral slide, prevents scapular winging
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