Lower lighthouse mound

Colliculus inferior

Lower collikel, Four-pile, lower, Collikel, lower, ,

Colliculus inferior, one on hay. and one on the left. side of the midline, is connected to the inner knee body of the corresponding side by the lower four-mound arm (Brachium colliculi inferioris).
The lower four-mound pair is an important switching station within the hearing system.