CN I – Olfactory (Sensory) • Function: smell, exit from cribiform plate (ethmoid) • Lesion à hyposmia, dysosmia, or anosmia (all are problems with smell) Ø Tearing meninges or fracture à CSF rhinorrhea (CSF discharge from nostrils) • Cell bodies scattered in olfactory mucosa, neurons are turned over every 30-120 days