Skeletal Muscle Groups

Head and Neck Facial muscles Orbicularis oculi= circular muscle around the eye Orbicularis oris= circular muscle around the mouth Zygomaticus=smiling muscles Masseter=mastication Temporal= mastication

Head and Neck Sternocleidomastoid: flexes head Trapezius: shrugs shoulders, extends head

Upper Extremities Pectoralis major: flexes upper arm (chest muscle) Latissimus Dorsi: extends upper arm (on back) Deltoid: abducts upper arm Biceps Brachii: flexes forearm Triceps Brachii: extends forearm

Trunk/Torso Abdominals: Rectus Abdominus (6 pack) External Oblique (R & L flank) Internal Oblique Transverse Abdominus

Respiratory Muscles Intercostals (between each rib) Diaphragm

Muscles that move lower extremities Gluteus Maximus: extends thigh Adductor Muscles: adducts thighs Hamstring Muscles: Semimembraneous Semitendinosus Flexes Lower Leg Biceps Femoris

Quadriceps femoris Extends lower leg Rectus femoris Vastus Lateralis Vastus intermedius Vastus medialis

Muscles of lower leg Tibialis anterior: dorsiflexes foot Gastrocnemius: plantar flexes foot Peroneus Group: flexes foot

Types of Movements Flexion: decreases the angle between 2 bones at the joint.. (Bending) Extension: increases the angle between 2 bones at the joint…(straightening) Abduction: movement away from the midline Adduction: Movement toward the midline

Types of Movement Rotation: movement around a longitudinal axis Hand positions that results from rotation of the forearm. Supination Pronation