| CSN | cardiac sympathetic nerve; carotid sinus nerve |
|---|---|
| NFL | nerve fiber layer; neurofilament protein, light polypeptide |
| NFLD | nerve fiber layer defect |
| NE | national emergency; necrotic enteritis; necrotizing enterocolitis; nephropathia epidemica; nerve end... |
| NRI | nerve root involvement; nerve root irritation; nonrespiratory infection |