Collectively the colliculi are referred to as the corpora quadrigemina.
2.
The midbrain comprises the tectum ( or corpora quadrigemina ), tegmentum, the cerebral aqueduct ( or ventricular mesocoelia or " iter " ), and the cerebral peduncles, as well as several nuclei and fasciculi . rostrally it adjoins the diencephalon ( thalamus, hypothalamus, etc .)
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