Final answer:
The air-filled space in bone is one of the types of bone markings and is commonly found within certain bones. These spaces are known as sinuses and are not connected to the nasal cavity.
Step-by-step explanation:
Bone Markings
The air-filled space in bone is one of the types of bone markings. Bone markings refer to the surface features of bones that vary depending on their function and location in the body. The air-filled spaces in bones are commonly found within the frontal, maxilla, sphenoid, and ethmoid bones. These spaces, known as sinuses, are not connected to the nasal cavity and are divided at the midline by the nasal septum.