| Answer | Crossword Clue |
|---|---|
| SYNAPTIC | ... cleft (space in the brain) |
| intrathecal | introduced into or occurring in the space under the arachnoid membrane of the brain or spinal cord |
| intrathecally | INTRATHECAL, introduced into or occurring in the space under the arachnoid membrane of the brain or spinal cord |
| subarachnoid | Denoting or occurring in the fluid-filled space around the brain between the arachnoid membrane and the pia mater, through which major blood vessels pass |
| PEA | Space cadet's brain size? |
