Definition of tectum in English:

tectum

Line breaks: tec¦tum
Pronunciation: /ˈtɛktəm
 
/

noun

Anatomy
  • 1The uppermost part of the midbrain, lying to the rear of the cerebral aqueduct.
    More example sentences
    • Although medial and lateral gaze palsies are typical, patients usually retain upper eyelid control and vertical eye movement because of sparing of the mid-brain tectum, which allows communication.
    • Each trochlear nerve makes its exit through the caudal tectum (the dorsal portion of the midbrain), immediately lateral to the frenulum of the superior medullary velum.
    • Recently, we presented evidence for an involvement of histamine in the generation and organization of such defensive reactions in the midbrain tectum.
  • 1.1 (in full optic tectum) A rounded swelling (colliculus) forming part of the tectum and containing cells involved in the visual system.
    More example sentences
    • Brains were removed and dissected into telencephalon (excluding the olfactory bulbs), hypothalamus (excluding the pituitary), optic tectum, and brain stem (excluding the cerebellum).
    • In fish, the optic tecta and cerebellum, which can be thought of as the functional equivalent of the optic lobes, occupy approximately one-half of total brain volume.
    • However, expression appeared to be greater in the cerebellum, ectostriatum, paleostriatum, and layers of the optic tectum, suggesting regional differences in regulation.

Origin

early 20th century: from Latin, literally 'roof'.

More definitions of tectum

Definition of tectum in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day milord
Pronunciation: mɪˈlɔːd
noun
used to address an English nobleman