Final answer:
The tectum of the midbrain houses the superior and inferior colliculi, which are involved in visual and auditory processing, respectively.
Step-by-step explanation:
The nuclei located in the tectum of the midbrain include structures that are crucial for visual and auditory processing. These are the superior colliculi and the inferior colliculi.
The superior colliculi are involved in preliminary visual processing and eye movements, while the inferior colliculi are part of the auditory pathway and are involved in hearing.
It is important to understand that the tectum is different from the tegmentum of the midbrain which contains other nuclei such as the substantia nigra and the ventral tegmental area (VTA), both critical for movement and implicated in Parkinson's disease. Additionally, the Edinger-Westphal nucleus, which is responsible for the pupillary reflex and lens control via its parasympathetic innervation, is also located in the midbrain.