statotonic

adjective

stato·​ton·​ic ˌstat-ə-ˈtän-ik 

: of, relating to, or being a tonic reflex that serves to establish or maintain the posture of an individual against the force of gravity and that is initiated by stimulation of the utricle of the labyrinth through position of the head or movements of the neck muscles and involves alteration of skeletal muscle tone

statotonic reflexes

compare statokinetic