| ERTAS | extended reticulo-thalamic activating system |
|---|---|
| STPS | specific thalamic projection system |
| TPN | thalamic projection neuron; total parenteral nutrition; transition protein; triphosphopyridine nucle... |
| LSO | lateral superior olive; left salpingo-oophorectomy; left superior oblique; lumbosacral orthosis |
| RSO | radiation safety officer; Resident Surgical Officer; right superior oblique [muscle] |