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Although medial and lateral gaze palsies are typical, patients usually retain upper eyelid control and vertical eye movement because of sparing of the mid-brain tectum , which allows communication.
Each trochlear nerve makes its exit through the caudal tectum (the dorsal portion of the midbrain), immediately lateral to the frenulum of the superior medullary velum.
Recently, we presented evidence for an involvement of histamine in the generation and organization of such defensive reactions in the midbrain tectum .
Cavefish have reduced the size of their optic tecta , the region of the brain responsible for interpreting visual information.
In fish, the optic tecta and cerebellum, which can be thought of as the functional equivalent of the optic lobes, occupy approximately one-half of total brain volume.
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