Skeletal Muscles and Their Actions

Elevates and protracts mandible

Elevates and retracts mandible

Lateral flexion and rotation to opposite side of neck

Neck flexion

Elevate ribs during inspiration

Depress ribs during forced expiration

Flattens to increase thoracic volume for inspiration

Pulls ribs downward, flexes vertebral column, compresses abdomen

Laterally flexes and rotates vertebral column, compresses abdomen

Elevates and adducts scapula; neck flexion to same side

Depresses and protracts scapula

Elevates scapula and extends neck

Arm abduction; anterior fibers flex and medially rotate; posterior fibers extend and laterally rotate

Flexion and supination of forearm; long head also flexes arm

Extension of forearm; long head extends and adducts arm

Extension, abduction, and lateral rotation of thigh

Flexion, abduction, and lateral rotation of thigh; knee flexion

Extension of leg; hip flexion

Dorsiflexion and inversion of foot

Plantar flexion of foot; flexion at knee

Plantar flexion of foot

Plantar flexion and eversion of foot