38. Medulla External Features2
Pyramids: Two vertical bulges on either side of the fissure, housing the corticospinal (motor) fibers. Olive: An oval swelling lateral to the pyramids, containing the olivary nucleus, important for movement Posterolateral Sulcus (Post-olivary): Lateral to the olive, where the Glossopharyngeal (CN IX), Vagus (CN X), and Accessory (CN XI) nerves emerge