| C4 | fourth cervical nerve; fourth cervical vertebra; fourth component of complement |
|---|---|
| L | 1) Lumbar Vertebrae L1; 1st Lumbar Vertebrae &... |
| L1, | L2, L3, L4, L5 first, second, third, fourth, and fifth lumbar vertebrae |
| CIV | fourth cranial nerve |
| C4a | activated fourth component of complement |