HBS 4.2.1 Muscle Rules
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Rule #3
attachment that moves is the insertion attachment that remains stationary is the origin
Rule #6
Muscle striations point to the attachment and show the pull of direction
Rule #2
Muscles "pull" and get shorter
Rule #1
Muscles have two+ attachments and must cross at least one joint
Rule #4
Muscles that decrease angle between ventral surfaces are flexors. Muscles that increase angle between ventral surfaces are extensors.
Rule #5
Muscles work in opposing pairs
