abnormal medulla oblongata morphology abnormal inferior olivary complex morphology MP:0003684 MPheno.ontology abnormal inferior olivary nucleus morphology abnormal inferior olive morphology abnormal oliva morphology any structural anomaly in the capsule-shaped structure in the ventral medulla located just lateral and dorsal to the medullary pyramids; neurons in the inferior olivary nucleus are the source of climbing fiber input to the cerebellar cortex and have been implicated in various functions, such as learning and timing of movements