tectum of the mesencephalon


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tectum of the mesencephalon 

Structure comprising the plate of grey and white matter (called the tectal lamina) that forms the roof of the midbrain and from which project the inferior and superior colliculi. The area anterior to it is called the pretectal region. Syn. tectum of the midbrain; optic tectum. Note: The word tectum comes from the Latin and means roof. The word mesencephalon is made up of two parts that come from the Greek and means middle brain. See inferior colliculi; superior colliculi; pupillary fibres; convergence-retraction nystagmus; retinotectal pathway; pretectum.