Click here to get the ‘Part 5: BPPV Nomenclature is Canal-Based — NOT Muscle Based’ handout The posterior canal connects to the ipsilateral Superior Oblique (SO) and contralateral Inferior Rectus (IR) — muscles that pull the eye DOWN. So why does posterior canal BPPV produce UPbeating nystagmus? If you’ve ever paused mid-explanation, trying to reconcile muscle […]