tectum (Latin: roof) is a region of the brain, specifically the dorsal part of the mesencephalon (midbrain). This is contrasted with the tegmentum, which refers to the region ventral to the ventricular system. The tectum is responsible for auditory and visual reflexes.
It is derived in embryonic development from the
alar plate of the neural tube.
Colliculi [ edit ]
In adult humans, it only consists of the
inferior and the superior colliculi.
The superior colliculus is involved in preliminary
visual processing and control of eye movements. In non-mammalian vertebrates it serves as the main visual area of the brain, functionally analogous to the visual areas of the cerebral cortex in mammals.
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. Collectively the colliculi are referred to as the corpora quadrigemina.
Related terms [ edit ]
The term "tectal plate" (or "quadrigeminal plate") is used to describe the junction of the gray and white matter in the embryo. (
NeuroNames ) ancil-453
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