Definition of tentorium in English:

Share this entry


Pronunciation: /tenˈtôrēəm/

noun (plural tentoria /-ˈtôrēə/)

1 Anatomy A fold of the dura mater forming a partition between the cerebrum and cerebellum.
Example sentences
  • The straight sinus, located at the site of attachment of the falx cerebri to the tentorium cerebelli, has been opened.
  • The tentorium cerebelli is continuous with the posterior and anterior petroclinoid ligaments.
  • The free front margin of the tentorium fits closely round the back of the brain stem; the brain stem can be damaged, for example if a tumour growing above or below the ‘tent’ encroaches on this narrow space.
2 Entomology An internal skeletal framework in the head of an insect.
Example sentences
  • More posterior head skeletal structures and the tentorium do not develop in these embryos.
  • Indeed, this family has various plesiomorphic features, such as a complete tentorium and a mouthcone that is nearly bilaterally symmetrical, and as such it is clearly a basal group of thrips.


Early 19th century: from Latin, literally 'tent'.

For editors and proofreaders

Syllabification: ten·to·ri·um

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.