Muscular System

Smooth muscles

• walls of hollow organs and ducts

• operated involuntarily

• responsible for peristalsis (digestive tracts)

cardiac muscles

• myocardium of heart wall

• functions involuntarily

• responsible for pumping of heart

skeletal muscles

• attached to bones

• responsible for voluntary movement

• maintains posture

• generates large portion of body heat

gluteus maximus

butt

gastrocnemius

main calf muscle

trapezius

back of the neck to middle back,

across your shoulder blades

supraspinatus

small rotator cuff muscle in shoulder

biceps/biceps brachii

between shoulder and elbow (anterior)

subscapularus

front side of shoulder blade

largest and strongest of 4 rotator cuffs

abduction

movement away from the midline of the body

addduction

movement toward the midline of the body

supination

turning upward

pronation

turning downward

flexión

closing the angle at a join

extensión

opening the angle at a joint

inversion

turning inward

eversion

turning outward

endocardium

innermost and thinnest wall of the heart

myocardium

• thick muscular middle layer of the heart

• responsible for pumping blood

epicardium

• outermost layer of the heart wall

• innermost layer of protective sac