tentorium

Noun

tentorium (plural tentoria or tentoriums)

1. The framework of internal supports (a false endoskeleton) within an arthropod head, formed by ingrowths of the exoskeleton called apophyses.
   • In the female of Culex the tentoria arise in front of the border of the occipital foramen and ascend at an angle of twenty-five degrees with the floor of the head.1906, Milett T. Thompson, Alimentary Canal of the Mosquito: (Anopheles Punctipennis)
2. The tentorium cerebelli, an extension of the dura mater that separates the cerebellum from the inferior portion of the occipital lobes.
   • Four dogs with intact tentoriums survived 6 weeks and 8 with sectioned tentoriums survived the same period of time.1961, Progress in Neurology and Psychiatry, page 345