noun (plural tentoria /tɛnˈtɔːrɪə/)
1 Anatomy A fold of the dura mater forming a partition between the cerebrum and cerebellum.
- 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.
- 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'.
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