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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 |