Skeletal Muscle GroupsSkeletal Muscle Groups

Head and NeckHead and Neck

Facial musclesFacial muscles– Orbicularis oculi= circular muscle around the Orbicularis oculi= circular muscle around the

eyeeye– Orbicularis oris= circular muscle around the Orbicularis oris= circular muscle around the

mouthmouth– Zygomaticus=smiling musclesZygomaticus=smiling muscles– Masseter=mastication Masseter=mastication – Temporal= mastication Temporal= mastication

Head and NeckHead and Neck

Sternocleidomastoid: flexes headSternocleidomastoid: flexes head Trapezius: shrugs shoulders, extends headTrapezius: shrugs shoulders, extends head

Upper ExtremitiesUpper Extremities

Pectoralis major: flexes upper arm (chest Pectoralis major: flexes upper arm (chest muscle)muscle)

Latissimus Dorsi: extends upper arm (on Latissimus Dorsi: extends upper arm (on back)back)

Deltoid: abducts upper armDeltoid: abducts upper arm Biceps Brachii: flexes forearmBiceps Brachii: flexes forearm Triceps Brachii: extends forearmTriceps Brachii: extends forearm

Trunk/TorsoTrunk/Torso

Abdominals: Abdominals: – Rectus Abdominus (6 pack)Rectus Abdominus (6 pack)– External Oblique (R & L flank)External Oblique (R & L flank)– Internal ObliqueInternal Oblique– Transverse AbdominusTransverse Abdominus

Respiratory MusclesRespiratory Muscles

Intercostals (between each rib)Intercostals (between each rib) DiaphragmDiaphragm

Muscles that move lower Muscles that move lower extremitiesextremities

Gluteus Maximus: extends thighGluteus Maximus: extends thigh Adductor Muscles: adducts thighsAdductor Muscles: adducts thighs Hamstring Muscles:Hamstring Muscles:

– SemimembraneousSemimembraneous– Semitendinosus Flexes Lower LegSemitendinosus Flexes Lower Leg– Biceps FemorisBiceps Femoris

Quadriceps femorisQuadriceps femoris

Extends lower legExtends lower leg Rectus femorisRectus femoris Vastus LateralisVastus Lateralis Vastus intermediusVastus intermedius Vastus medialisVastus medialis

Muscles of lower legMuscles of lower leg

Tibialis anterior: dorsiflexes footTibialis anterior: dorsiflexes foot Gastrocnemius: plantar flexes footGastrocnemius: plantar flexes foot Peroneus Group: flexes footPeroneus Group: flexes foot

Types of MovementsTypes of Movements

Flexion: decreases the angle between Flexion: decreases the angle between 2 bones at the joint.. (Bending)2 bones at the joint.. (Bending)

Extension: increases the angle between Extension: increases the angle between 2 bones at the joint…(straightening)2 bones at the joint…(straightening)

Abduction: movement away from the Abduction: movement away from the midlinemidline

Adduction: Movement toward the Adduction: Movement toward the midlinemidline

Types of MovementTypes of Movement

Rotation: movement around a longitudinal Rotation: movement around a longitudinal axisaxis

Hand positions that results from rotation of the Hand positions that results from rotation of the forearm.forearm.

SupinationSupination

Pronation Pronation