Across
- 3. made of connective tissue reinforced with calcium and specialised bone cells.
- 4. Each cavity consists of a roof, floor, medial wall, and lateral wall. Within each cavity are three regions; nasal vestibule, respiratory region, and olfactory region.
Down
- 1. a set of bones that course from your spinal column, around your body, and attach to your sternum, or breastbone.
- 2. Each vertebra is separated by a disc. The vertebrae surround and protect the spinal cord.