Q: Which of the following structures is included in the tectum?  

Answer: A

The tectum, also known as the roof of the midbrain, is a region of the brainstem that is involved in sensory processing. It is composed of two main structures, the superior colliculus and the inferior colliculus. The superior colliculus is responsible for processing visual information and plays an important role in orienting the eyes and head towards visual stimuli. The inferior colliculus, on the other hand, is involved in processing auditory information. Therefore, option A, the superior colliculus, is the correct answer. The periaqueductal grey, substantia nigra, and red nucleus are not part of the tectum, but rather are located in other areas of the midbrain and are involved in various functions such as pain modulation, motor control, and reward processing.

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