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3 Major types
- 1.Skeletal
- 2.Cardiac
- 3.Smooth
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Muscle Structure
whole muscle--->Muscle fassicles--->Muscle fibers--->Myofibrils--->Myofilaments(actin and myosin)
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Sheaths of CT--> muscle structure
- Epimysium: surround entire muscle
- Perimysium: surround group of muscle fibers called fasicles
- Endomysium: surround single muscle fibers
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within each muscle fiber there is:
- -mitochondria " energy factor" ATP production
- -capillaries: Bring O2 & remove waste
- -nerve endings: stimulate musle contract
- *small vessels slow blood down*
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Skeletal muscle
- Function: movement, form, heat
- -cells striated and multi nucleate
- -fleshy contractile protion
- -white non contractile portion-tendon (round) aponeurosis (flat)
- -attached from tendon or aponeurosis to bone, ligament, cartilage or fascia
- -some attach to organs-eyeballs
- -some attach to skin- facial muscles
- -some attach to membranes- tongue muscles
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Origin
-attachment of tendon to stationary bone
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Insertion
attachment muscles to other tendon to movable bone
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Action
main movement that occur during contraction
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Prime mover or agonist
responsible for action
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Antagonist
stretches to yield effect of agonist
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Synergists
- -aid in movement of agonist
- -contract & stabilize intermediate joints
- -Biceps and Brrachialis
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Fixators
- -stabilize origin of agonsit so agonist os mre efficient
- -proximal part of limb steady, distal part is where movement occur
- -Roator cuff
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