superior Colliculi


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Colliculi, superior 

Two small rounded elevations situated on the dorsal aspects of the midbrain, just below the thalamus. Besides receiving fibres from each other, they receive a small number of axons from the optic tracts and serve as a relay centre for movements of the eyes, head and neck in response to visual and other stimuli. Singular: colliculus. Syn. superior corpora quadrigemina. See brachium; retinotectal pathway; pretectum; Parinaud's syndrome.
References in periodicals archive ?
The largest axis of the colliculi in the human measures 10-12 mm, from the front to the outside, and the transverse axis just 7-8 mm, whereas in the spider monkey the superoinferior diameter of the superior colliculi was 6.15 mm and their transverse diameter 5.45 mm (Fig.
The tectum is formed by the superior colliculi which is related to the visual system and the inferior colliculi which are part of the auditory system.[23] The crus cerebri and the tegmentum, also known as the cerebral peduncles, are composed of the corticospinal and corticopontine descending motor tracts.
Several small, pitted lesions with dark rims were noted in the neuropil of the thalami, superior colliculi, and hippocampus.

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