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The third and fourth cranial nerves originate from the midbrain: 1  oculomotor nerve (CN III) 2  trochlear nerve (CN IV)
Midbrain . Explanations > Brains > Parts > Midbrain. Tectum | Tegmentum | See also . The midbrain, or mesencephalon is made up of two main structures and surrounds the cerebral aqueduct. Tectum. The tectum is in the dorsal part of the midbrain. The superior colliculi are a part of the visual system and are involved in visual reflexes and reactions to moving stimuli. The inferior colliculi appear as four bumps on the dorsal surface of the brain stem and are a part of the auditory system. Tegmentum. The tegmentum sits beneath the tectum. Reticular formation The reticular formation ('little net') is a large and complex structure of over 90 nuclei that sits at the core of the brain stem.