ventral surface of the brain stem Medulla oblongata yramid contain pyramidal tract (corticospinal tract) Decussation of pyramid formed by crossing fibers of corticospinal tract Olive: overlying inferior olivary nucleus hypoglossal nerve emerge from anterolateral sulcus Glossopharyngeal n. emerge from vagus n. retroolivary sulcus accessory nventral surface of the brain stem Pyramid : contain pyramidal tract (corticospinal tract) Decussation of pyramid formed by crossing fibers of corticospinal tract emerge from retroolivary sulcus Medulla oblongata hypoglossal nerve emerge from anterolateral sulcus Glossopharyngeal n. vagus n. accessory n. Olive : overlying inferior olivary nucleus