Across
- 4. thin transparent layer that covers the front of the eye
- 6. largest part of the human brain
- 7. ring-like bony structures connecting the skull and vertebral column
- 8. holds the bones together at the joints
Down
- 1. protects the delicate spinal cord
- 2. also called the brain stem
- 3. protects our heart and lungs
- 5. carry messages back and forth like telephone wires