\Vas`o*mo"tor\, a. [L. vas a vessel + motor that which
moves fr. movere to move.] (Physiol.)
Causing movement in the walls of vessels; as, the vasomotor
mechanisms; the vasomotor nerves, a system of nerves
distributed over the muscular coats of the blood vessels.
{Vasomotor center}, the chief dominating or general center
   which supplies all the unstriped muscles of the arterial
   system with motor nerves, situated in a part of the
   medulla oblongata; a center of reflex action by the
   working of which afferent impulses are changed into
   efferent, -- vasomotor impulses leading either to dilation
   or constriction of the blood vessels.