Show sinuses the calls orca or cavities vitlem contained 1 in certain bo bone begs as the iron frontal tul etli mold sphenoid ond end superior maxillary are called sinuses the frontal ilni sinuses ses are two irregular upward P ed d outward fi from om their op opan n ingdon each side of nf tho the spine between the inner and outer layers of the skull and separated from one anther another ano 0 by a aln thin bony septum they give falve rise to rhe aie ab nb abe ve the root ot athe the nose called the naba eminences |