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upper torso muscles
origin insertions and actions - gym instructor
Muscle of upper torso | Origin | Insertion | Action |
---|---|---|---|
Deltoid - anterior - lateral - posterior | clavicle and scapula | humerus | shoulder abduction - flexion - extension & rotation |
Pectoralis major | clavicle, sternum and ribs | humerus | shoulder adduction (horizontal) |
rhomboids major & minor (back between shoulder blades) | cervical and thoracic vertebrae | scapula | shoulder girdle retraction (squeeze shoulder blades together) |
trapezius upper | base of skull and cervical vertebrae | clavicle and scapula | lateral flexion of the neck roation of the neck adduction of scapula rotation of scapula |
trapezius middle | thoracic vertebrae | scapula | adducts scapula elevates scapula |
trapezius lower | thoracic vertebrae | scapula | depresses scapula |
supra.spinatus (rotator cuff) | scapula | humerus | assist deltoid in shoulder abduction |
infran.spinatus (rotator cuff) | scapula | humerus | laterally rotates & adducts shoulder |
teres major & minor (beneath rhomboids) | scapula | humerus | shoulder extension & adduction |
pectoralis minor (front chest) | ribs | scapula | depresses scapula elevates ribs 3-5 during forced inspiration |