Muscle Names and Actions Biceps Brachii Muscle Name: Biceps brachii Muscle Action: Elbow flexion Biceps Femoris Muscle Name: Biceps femoris Muscle Action: Knee flexion Deltoid Muscle Name: Deltoid Muscle Action: Shoulder abduction External Oblique Muscle Name: External oblique Muscle Action: Lumbar rotation Frontalis Muscle Name: Frontalis Muscle Action: Eyebrow elevation Gastrocnemius Muscle Name: Gastrocnemius Muscle Action: Plantarflexion Gluteus Maximus Muscle Name: Gluteus maximus Muscle Action: Hip extension Masseter Muscle Name: Masseter Muscle Action: Mandible elevation (jaw closure) Orbicularis Oculi Muscle Name: Orbicularis oculi Muscle Action: Eye closure (wink) Orbicularis Oris Muscle Name: Orbicularis oris Muscle Action: Puckers lips (kiss) Pectoralis Major Muscle Name: Pectoralis major Muscle Action: Shoulder adduction Rectus Abdominis Muscle Name: Rectus abdominis Muscle Action: Lumbar flexion Rectus Femoris Muscle Name: Rectus femoris Muscle Action: Knee extension Sartorius Muscle Name: Sartorius Muscle Action: Hip abduction and external rotation (pretzel sit) Sternocleidomastoid Muscle Name: Sternocleidomastoid (SCM) Muscle Action: Cervical flexion and rotation Temporalis Muscle Name: Temporalis Muscle Action: Synergist to jaw closure Tibialis Anterior Muscle Name: Tibialis anterior Muscle Action: Dorsiflexion Trapezius Muscle Name: Trapezius Muscle Action: Shoulder elevation, Scapular retraction, Cervical extension Triceps Brachii Muscle Name: Triceps brachii Muscle Action: Elbow extension Zygomaticus Muscle Name: Zygomaticus Muscle Action: ”Smile” Latissimus Dorsi Muscle Name: Latissimus Dorsi Muscle Action: Shoulder Extension