<prompt> Descending motor tract responsible for rapid skilled movements.Anterior corticospinal tractRubrospinal tractVestibulospinal tractReticulospinal tract  <response>: Ans. is b i.e., Rubrospinal tract o Pyramidal corticospinal tract and extrapyramidal tracts concerned with the muscles of the trunk and proximal portion of limbs Le., the muscle mainly concerned with the postural control occupy anterior white column of spinal cord and terminate in the medial ventral horn on the medial group of intemeurons. These tracts are collectively called medial pathways. Medial pathways include ventral anterior corticospinal tract, vestibulospinal tracts, reticulospinal tract and rubrospinal tract.o On the other hand, descending tracts concerned with distal muscles of the limb i.e., those muscles which mediate fine skilled movementsA1 13 occupy lateral white column and are called lateral pathways. Lateral pathways include lateral corticospinal tract and rubrospinal tracts. 