An arm. B. conjunctivum, the bundle of fibers which connects the cerebellum and midbrain, the superior cerebellar peduncle. B. pontis, the bundle of fibers which connects the cerebellum and pons, the middle cerebellar peduncle. Superior B., the bundle of fibers which connects the superior quadrigeminate with the lateral geniculate body. Inferior B., the bundle of fibers which connects the inferior quadrigeminate body to the medial geniculate body.