Anatomy & Physiology - CH9B Muscle Anatomy

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