Colliculus refers to a small bumps or hillocks, usually located in the midbrain. There are different types of colliculus, including the superior colliculus (located in the posterior part of the midbrain) and the inferior colliculus (found in the posterior part of the brainstem). Synonyms for colliculus may include: eminence, prominence, hillock, bump, knob, protuberance, or elevated region. These terms are used to describe a small elevation or projection on a surface. In neuroscience, the terms colliculus and tectum are often used interchangeably to refer to the bumps or structures in the midbrain that are involved in sensory processing.