In the brain, the corpora quadrigemina (Latin for "quadruplet bodies") are the four colliculi—two inferior, two superior—located on the posterior aspect of the midbrain.
cerebral peduncle: midbrain tegmentum (periaqueductal gray, ventral tegmentum, nucleus raphe dorsalis), pretectum, substantia nigra, red nucleus, pedunculopontine nucleus, medial longitudinal fasciculus, medial lemniscus, rubrospinal tract, lateral lemniscus
tectum: corpora quadrigemina, inferior colliculi, superior colliculi
cerebral aqueduct: oculomotor nucleus, trochlear nucleus, Edinger-Westphal nucleus
