tectum

 
Pronunciation: /ˈtɛktəm/

noun

Anatomy
  • the uppermost part of the midbrain, lying to the rear of the cerebral aqueduct.
  • (in full optic tectum) a rounded swelling (colliculus) forming part of this and containing cells involved in the visual system.

Origin:

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