THE MUSCULAR SYSTEM

1. How do skeletal muscles produce movement?2. Group movements3. Review of superficial skeletal muscles – anterior4. Review of superficial skeletal muscles - posterior

HOW DO SKELETAL MUSCLES

PRODUCE MOVEMENT?

Exert force on tendons

Tendons cross joint(s)

Joints act as the fulcrum of a lever system

Origin versus insertion

Gaster (belly)coracoid process

origins (heads) of biceps brachii

bellies of biceps brachii

radius

insertion of biceps brachii

GROUP MOVEMENTS

Prime mover (agonist)

Antagonist

Synergist(s)

Fixator(s)

FLEXORSbiceps brachii

brachialis

EXTENSORStriceps brachii

REVIEW OF SUPERFICIAL SKELETAL MUSCLES

sternocleidomastoid

pectoralis major

biceps brachii

external abdominal oblique

gluteus medius

rectus femoris

vastus lateralis

tibialis anterior

deltoid

triceps brachii

rectus abdominis

sartorius

vastus medialis

gastrocnemius

temporalis

masseter

Serratus anterior

gracilis

REVIEW OF SUPERFICIAL SKELETAL MUSCLES

masseter

deltoid

end

trapezius

triceps brachii

latissimus dorsi

gluteus maximus

tensor fascia lata

biceps femoris

gastrocnemius

external abdominal oblique

semimembranosus

Semitendinosus (more lateral)