 Major Muscles of the Human Body Follow along as we roll the cursor over each muscle name to see its corresponding location on the body. Read the white box at the bottom of the screen for any additional information about the muscle. Abdominal Epineurosis Biceps brachii flexes the forearm at the elbow and supinates the hand. Brachioradialis flexes the forearm and elbow. Deltoid abducts the arm. Extensor Carpi extends the hand. External Oblique flexor Carpi. Gastrocnemius planter flexes the foot at the ankle as in tiptoeing. Hip adductors made up of five muscles in the medial compartment of the thigh. Intercostal. Elevates the ribs and enlarges the thoracic cavity. Internal Oblique. Obicularis oculi. Closes the eye. Orbicularis aureus. Closes the mouth. Pectoralis major flexes and adducts the arm across the chest. Pulls the shoulders forward. Longus quadriceps femoris extends the leg. Rectus abdominis flexes the vertebral column and draws the chest downward. Rectus femoris flexes the thigh at the hip and helps to extend the leg at the knee. Sartorius serratus anterior acts to rotate the scapula and raise the shoulder. Soleus causes plantar flexion of the foot. Sternocleidomastoid. Temple. Tibialis anterior dorsiflexes and inverts the foot. Trapezius raises the shoulder and pulls it back, extends the head. Zygomaticus. You have completed this learning activity. Major muscles of the human body.