To provide information on the glutamatergic synapses on the trigeminal motoneurons, which may be important for understanding the mechanism of control of jaw movements, we investigated the distribution of vesicular glutamate transporter (VGLUT)1immunopositive (+) and VGLUT2 + axon terminals (boutons) on the rat jawclosing (JC) and jawopening (JO) motoneurons, and their .