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.