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The muscle that has the major responsibility for causing a particular movement

Muscles that oppose or reverse a movement.

When a prime mover is active, its antagonist is

helpers of prime movers by producing the same movement or by reducing undesirable movements.

They hold a bone still or stabilize the origin of a prime mover so all the tension can be used to move the insertion bone. The postural muscles that stabilize the vertebral column are fixators, as are the muscles that anchor the scapulae to the thorax.

Muscles are named according to

direction - straight

direction - slant

muscles of head and neck (OOOTZBM)

raises eyebrows (forehead)

allow blinking (eyes)

kissing muscle (mouth)

synergist of the masseter in closing the jaw

smiling muscle (cheek)

it flattens the cheek (as in whistling or blowing a trumpet)

chewing (masticaton) muscle

covers the anterolateral neck
pull the corners of the mouth inferiorly, producing a downward sag of the mouth

muscles are two headed muscles, one found on each side of the neck.