tectum of the mesencephalon

(redirected from tectum of the midbrain)

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.
References in periodicals archive ?
Light-near dissociation can be caused by severe loss of afferent light input to both eyes, caused by damage to the retina or optic nerve pathways, or samage at the tectum of the midbrain, causing loss of pretectal light input to the Edinger-Westphal nucleus (part of the parasympathetic chain of pupillary innervation).