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Ch. 11 Muscular System: Axial and Appendicular Muscles (Actions (Agonist…
Ch. 11 Muscular System: Axial and Appendicular Muscles
Origin
Origo = source
Proximal and less movable attachment of a muscle
Insertion
Inserto = to plant in
Distal and more movable attachment of a muscle
Actions
Agonist
Agon = a contest
Muscle that contracts to produce a particular movement
Antagonist
Anti = against
Muscle whose actions oppose those of the agonist
Synergist
Syn = with, ergo = work
Muscle that assists the agonist in performing its action
Location
Rules
Muscle that crosses on the anterior side of a joint produces flexion
Muscle that crosses on the posterior side of a joint produces extension
Muscle that crosses on the lateral side of a joint produces abduction
Muscle that crosses on the medial side of a joint produces adduction
Compartments
Anterior
Posterior
Lateral