Deep dissection of brain-stem. Lateral view.
|Anatomical terms of neuroanatomy|
The tectum (Latin: roof) is a region of the brain, specifically the dorsal (top) part of the midbrain (mesencephalon). The position of the tectum is contrasted with the tegmentum, which refers to the region ventral (lower) to the ventricular system. The tectum is responsible for auditory and visual reflexes.
- 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.
- The inferior colliculus is involved in auditory processing. It receives input from various brain stem nuclei and projects to the medial geniculate nucleus of the thalamus, which relays auditory information to the primary auditory cortex.
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.
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- "Anatomy diagram: 13048.000-3". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2014-01-01.
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