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Trunk Muscles
Trunk Muscles action
| Question | Answer |
|---|---|
| Extends neck and adducts scapula | trapezius |
| extend and adducts humerus | Latissimus dorsi |
| Abducts humerus | Deltoid |
| Extends arm | Triceps brachii |
| Adducts and flexes humerus | Pectoralis major |
| Flexes vertebral column | Rectus abdominis |
| Flexes and rotates vertebral column | external oblique |
| Flexion of Elbow | Brachioradialis |
| Internal rotation (medial rotation) of the humerus | Teres major |
| Laterally: Flex the head and neck to the same side. Bilaterally: Extend the vertebral column. | Spinalis |
| protracts and stabilizes scapula, assists in upward rotation. | Serratus anterior |
| Laterally: Flex the head and neck to the same side. Bilaterally: Extend the vertebral column. | Longissimus |
| Compresses abdominal contents | Transverse abdominis |
| laterally rotates the arm, stabilizes humerus | Teres minor |
| Laterally: Flex the head and neck to the same side. Bilaterally: Extend the vertebral column. | Iliocostalis |
| Lateral rotation of arm and stabilizes humerus | Infraspinatus |
| Flexes elbow and supinates elbow | Biceps brachii |
| Flexion of the elbow | Brachialis |
| Compresses abdomen; unilateral contraction rotates vertebral column to same side. | internal oblique |