The core of the midbrain is the small cerebral aqueduct. Here, the roof of the midbrain, also called tectum (Latin for 'roof') consists of the paired superior colliculi. The superior colliculus is part of the visual system and the substantia nigra is part of the motor system. The red nucleus is also a motor control structure, while the periaqueductal gray is important in the control of somatic pain sensations.
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