1. Skeletal Muscle Groups

2. Muscles of the head and neck Frontal – raises eyebrows Orbicularis oculi – closes eye Orbicularis oris – puckering Zygomaticus – smiling

3. Facial muscles contd. Masseter – closes jaw, elevates mandible Temporal – closes jaw Sternocleidomastoid – rotation of head/neck, flex neck on chest. Trapezius – extends head backwards and elevates the shoulders

4. Muscles of the upper extremity Pectoralis major – flexes and helps adduct upper arm Latissimus dorsi – extends and helps adduct upper arm Deltoid – abduct upper arm Biceps brachii – primary flexor of forearm Triceps brachii – extensor of elbow, straightening, boxers muscle

5. Muscles of the trunk - ABs 3 layers running in different directions which leads to strength and support On side External oblique – outermost layer Internal oblique- middle layer Transversus abdominis – innermost layer Rectus abdominis – band of muscles running down midline of abdomen from thorax to pubis

6. Ab muscles External oblique, internal oblique and transversus abdominis all compress the abdomen Rectus abdominis – flexes trunk

7. Muscles that move the lower extremities Iliopsoas – flexor of thigh or trunk, posture Sartorius – flexes thigh and rotates lower leg Gluteus maximus – extensor of the thigh, supports torso in erect position Adductor muscles- found on inner thigh, adducts thigh  Adductor longus, gracilis, pectineus

8. Upper leg muscles  Hamstring muscles – flexes knee Semimembranosus Semitendinosus Biceps femoris  Quadriceps femoris – covers upper thigh, extends lower leg Rectus femoris Vastus lateralis, intermedius, medialis

9. Lower leg muscles Tibialis anterior – dorsiflexes foot Gastrocnemius – (calf muscle) plantar flexion of foot (toe dancers muscle) Peroneus group () – plantar flex foot  Peroneus longus – support arch in foot  Peroneus brevis  Soleus