The Tectum Mesencephali, or tectum of the midbrain, is a part of the brain located in the upper region of the mesencephalon. It plays a crucial role in processing sensory information, particularly visual and auditory stimuli. The tectum is composed of two main structures called the superior colliculi and inferior colliculi, which are involved in reflexive movements and responses to visual and auditory cues. The superior colliculi help coordinate eye movements and visual attention, while the inferior colliculi are essential for auditory processing. Together, these structures enable the brain to integrate sensory information and respond appropriately to the environment, contributing to functions such as orientation and reflexive actions.