origin
attachment of a muscle tendon to the stationary bone
insertion
attachment of a muscle tendon to the movable bone
belly
fleshy portion of the muscle, usually covers the immovable bone
agonist (prime mover)
muscle primarily is responsible for producing an action; muscle that is contracting
antagonist
can resist a prime mover’s action and cause movement in an opposite direction; relaxing muscle
synergists
muscles assisting the prime mover
flexion
bones closer together, smaller angle
extension
bones farther, large angle
abduction
bring away from midline
adduction
bringing toward midline
pronation
palms down or back
supination
palms front or up
elevation
taking part up
depression
taking part down
circumduction
move circularly
inversion
soles inward, facing each other
eversion
sols outward, facing away from each other
action
named for the common movement of the muscle
direction
relative to the midline of the body
rectus
fibers run parallel to the midline
transverse
fibers run perpendicular to the midline
oblique
fibers run diagonally to midline
deltoid
having a triangular shapes
serratus
has a serrated look