The term posterior region of the motor thalamus refers to a composite substructure of the ventral nuclear group of the thalamus based on connectivity and function. It includes area X, the posterior ventral lateral nucleus, the pars postrema of the ventral lateral nucleus and the oral part of the ventral posterolateral nucleus, which receive projections primarily from the cerebellum. It, the anterolateral region of the motor thalamus and the anteromedial region of the motor thalamus constitute the motor thalamus ( Macchi-1997 ).