| Answer | Crossword Clue |
|---|---|
| SACRA | Lowest spinal bones. |
| medulla | the lowest or hindmost part of the brain, continuous with the spinal cord; the medulla oblongata |
| medullas | the lowest or hindmost part of the brain, continuous with the spinal cord; the medulla oblongata |
| SACRA | Spinal bones |
| SACRA | Spinal bones. |
| vertebra | one of the bones of the spinal column |
| vertebrae | Each of the series of small bones forming the backbone, having several projections for articulation and muscle attachment, and a hole through which the spinal cord passes |
