As a result of destruction of certain brainstem structures an animal has lost its orientative reflexes in response to strong photic stimuli. What structures were destroyed?

Answer options

1. Anterior tubercles of quadrigeminal plate
2. Red nuclei
3. Vestibular nuclei
4. Posterior tubercles of quadrigeminal plate
5. Black substance

Explanation

In the brain, the corpora quadrigemina (orientation responses) has four colliculi two inferior-posterior (for hearing), two superior-anterior (for vision) located on the tectum of the dorsal aspect of the midbrain. They have respectively named the inferior and superior colliculus.