Flexion
bending movement; decreases relative angle between segments
Extension
straightening movement; increases relative angle between segments
Plantarflexion
extension at the ankle
Dorsiflexion
flexion at the ankle
Abduction
movement in the frontal plane away from the middle
Adduction
movement in the frontal plane toward the middle
Horizontal abduction
transverse plane arm movement from the anterior to lateral (i.e. chest flyes)
Horizontal adduction
transverse plane arm movement from lateral to anterior
Internal rotation
rotation toward the middle of the body
External rotation
rotation away from the middle of the body