Repeated loss of frontal sinuses in arctoid carnivorans.

  title={Repeated loss of frontal sinuses in arctoid carnivorans.},
  author={Abigail A Curtis and George C. Lai and Fuwen Wei and Blaire Van Valkenburgh},
  journal={Journal of morphology},
  volume={276 1},
Many mammal skulls contain air spaces inside the bones surrounding the nasal chamber including the frontal, maxilla, ethmoid, and sphenoid, all of which are called paranasal sinuses. Within the Carnivora, frontal sinuses are usually present, but vary widely in size and shape. The causes of this variation are unclear, although there are some functional… CONTINUE READING