Agonist
Prime mover muscle in an action.
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Fitness: Movement Anatomy
Muscles and joints trainers use.
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Flashcards
Antagonist
Opposes the agonist.
Synergist
Assists the prime mover.
Stabilizer
Fixes a joint while others move.
Concentric
Muscle shortens under tension.
Eccentric
Muscle lengthens under tension.
Isometric
Muscle tension without length change.
Sagittal plane
Divides left/right; flexion/extension.
Frontal plane
Divides front/back; abduction/adduction.
Transverse plane
Rotation movements.
Origin / insertion
Fixed vs movable muscle attachments.
CNS
Central nervous system driving motor control.
Motor unit
Motor neuron + muscle fibers it innervates.
Kinetic chain
Linked joints/segments in movement.