Pectoral Muscles: Origin, Insertion, Innervation, and Action
Subclavius: Action
1. Anchor clavicle 2. Protect deeper neurovasculature 3. Prevent dislocation
Serratus Anterior: Action
1. Stabilize scapula - hold against ribs 2. Rotates scapula superiorly - shrug, protract, lift arm >90 3. Protect scapula (boxers muscle)
Pectoralis Minor: Action
1. Stabilize the scapula 2. Draw scapula anteriorly - stretching, reaching out 3. Elevate the ribs during inspiration
Pectoralis Minor: Insertion
Coracoid process (extension of scapula)
Serratus Anterior: Innervation
Long thoracic nerve
Subclavius: Innervation
Nerve to subclavius
Subclavius: Origin
Rib 1 (between bone and cartilage)
Serratus Anterior: Origin
Rib 1-8 (lateral border)
Pectoralis Major: Insertion
intertubercular sulcus/groove
Pectoralis Major: Action
1. Powerful adduction - adding arm back to body 2. Medial rotation - flex/roll arm in 3. Flexion- clavicular head (breaststroke muscle)
Subclavius: Insertion
Inferior surface of clavicle
Pectoralis Minor: Origin
Ribs 3,4,5 (b/w rib and cartilage)
Pectoralis Major: Innervation
Medial and Lateral pectoral nerves
Serratus Anterior: Insertion
Medial border of scapula
Pectoralis Major: Origin
Medial half of clavicle, along the sternum inferiorly
Pectoralis Minor: Innervation
Medial pectoral nerve