Todd was startled when the door slammed shut, the part of the brainstem that is responsible is the midbrain. The midbrain consists of the tectum and tegmentum, while the fore brain consists of the cerebrum, thalamus, and hypothalamus, and the hindbrain is made of the cerebellum, pons, and medulla. The midbrain serves important functions in motor movement, particularly movements of the eye, and in auditory and visual processing.