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Tectum

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The tectum (Latin: roof) is the dorsal part of the midbrain, derived in embryonic development from the alar plate of the neural tube. In adult humans it is present only in the mesencephalon (midbrain), as the inferior and the superior colliculi.

Both colliculi also have descending projections to the paramedian pontine reticular formation and spinal cord, and thus can be involved in responses to stimuli faster than cortical processing would allow.

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Mesencephalon (midbrain)

cerebral peduncle: midbrain tegmentum (periaqueductal gray, ventral tegmentum, nucleus raphe dorsalis), pretectum, substantia nigra, red nucleus, pedunculopontine nucleus, medial longitudinal fasciculus, medial lemniscus, rubrospinal tract, lateral lemniscus

tectum: corpora quadrigemina, inferior colliculi, superior colliculi

cerebral aqueduct: oculomotor nucleus, trochlear nucleus, Edinger-Westphal nucleus

de:Tectum
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