Mechanics of Muscle Movement
Terms
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- # of Points of attachment
- Muscles have 2 or more points of attachments to the skeleton
- Tendon
- Connects Ms to bone at each end
- Tendon structure
- connective tissue from the MS forms the tendon and connects to the periosteum of the bone
- Origin MS end
- The less movable part of the MS
- Insertion MS end
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MS attachment on the part of the body that moves
MORE MOVABLE end - Agonist
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-(prime mover) perform joint motion through a specific plane
-These perform the movement
-There can be more than 1 agonist - Antagonist
-
-Produces opposit move from Agonist. It relaxes as agonist contracts
-Roles can flip flop - Stabilizers
- (Fixators)MS that surround a body part and contract to fixate/stabilize the body part to enable another area to move
- Synergist
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-assists the agonist: guide refined movements; rule out unwanted movements
-NOT an agonist - Intrinsic
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MS found within the body part on which they acts
Hand MS are a good example - Extrinsic
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The proximal MS origin is outside
ex: wrist extension MS found on the humerus