The quadruple bodies (colliculi) situated on the tectal plate (tectum) on the midbrain posterior surface beneath the thalamus. There are two inferior and two superior colliculi, which are centers of reflex involving hearing and eye movement. There is an inferior and a superior colliculus on each side of the midline. They connect the hindbrain with the forebrain, and the superior colliculi are essential in the visual channel, while the inferior colliculi play a crucial role in the auditory pathway.