Some flat and irregular bones of the skull have air-filled spaces called ________.
A) epiphyseal spaces
B) medullary cavities
C) lacunae
D) sinuses
E) trabeculae

Question

Quizplus · Accepted Answer

Sinuses are air-filled spaces found in some flat and irregular bones of the skull, such as the frontal, maxillary, ethmoid, and sphenoid bones. These spaces help to reduce the weight of the skull and improve voice resonance.

Some Flat and Irregular Bones of the Skull Have Air-Filled