Muscular System

Muscle Function Movement

Not moving “freeze” Holding still

Posture Sitting Standing

Body heat Causes sweating Shivering

Types of Muscle tissue Striated

Aka Skeletal muscles Voluntary muscles Muscles of

movement Makes up the bulk of

the muscle of the body Example

Biceps Triceps

Striped in appearance (striated) Fascia

Tissue that separates bands of muscle fibers.

Types of Muscle tissue Cardiac muscle

Only found in heart Looks like striated

muscle Involuntary

Beat (contracts) w/out conscious thought

Forms the walls of the Ventricles atria

Types of Muscle tissue Smooth Muscle

non-striated No stripes

Involuntary Don’t have to

think about Found

Internal organs Except heart

Blood vessels Skin ducts

Muscle attachment Tendon

Attaches muscle to bone Achilles Attaches calf

muscle to heel of foot.

Muscle attachment Muscle origin

Where muscle attaches: To less moveable

end of the bone. More stationary

end of the bone. To the end of the

bone closest to the midline.

Muscle attachment Muscle Insertion

Point Where muscle

attaches:

To the more moveable end of the bone

End of the bone furthest from the midline

Muscle Action Contraction

Muscle become Shorter Thicker “make a muscle”

in your arm.

Relaxation Muscle becomes

Longer Thinner Return to normal

form / shape.

Muscle function!

Muscles only pull they don’t push. Because muscles only create movement

w/ contracting, most work or function in pairs.

Antagonistic pairs Are the muscles that work together to

create movement. Example Bicep = pulls in order to bend your arm Tricep = pulls in order to straighten your arm

Muscle conditions

Muscle tissue can be: Strained Sprained Cramped Inflamed Spasm

involuntary muscle contraction Atrophy

Muscle deterioration

Conclusion

Understanding muscles and how they work is an important part of your job.

In dentistry, muscles are related to chewing, swallowing, facial expression, and talking.

Remember you are looked at as the expert, you should know a little more than most of your patients.