As you review the muscle functions think in terms of functional groups.
Muscle |
Origin |
Insertion |
Action |
Pectoralis major | Sternum | Humerus (pectoral ridge) | Adducts Humerus |
Pectoralis minor | Sternum | Humerus (pectoral ridge) | Adducts Humerus |
Brachialis | Humerus | Ulna | Flex forearm |
Biceps brachii | Scapula | Radius | Flex forearm |
Triceps brachii | Scapula, Humerus | Ulna | Extend forearm |
Teres major | Scapula | Humerus | Retract arm |
Spinodeltoid | Scapula | Humerus | Retract arm - abduct arm |
Clavodeltoid | Clavicle | Humerus | Protract arm - abduct arm |
Levator scapulae ventralis | Atlas, skull | Spine of Scapula | Move scapula anteriorly |
Clavotrapezius | Skull, Cervical Vertebrae | Clavicle | Move clavicle anteriorly |
Acromiotrapezius | Cervical, Thoracic Vertebrae | Scapula | Support/rotate scapula |
Spinotrapezius | Thoracic Vertebrae | Spine of Scapula | Support/rotate scapula |
Latissimus dorsi | Lumbar Fascia Thoracic Vertebrae | Proximal end of Humerus | Retract arm |
Serratus ventralis | Ribs,Cervical Vertebrae | Scapula, medial surface | Support trunk, depress scapula |
Infraspinatus | Scapula | Humerus | Retract Humerus |
Supraspinatus | Scapula | Humerus | Protract Humerus |