Rostral interstitial nucleus of medial longitudinal fasciculus
The rostral interstitial nucleus of medial longitudinal fasciculus (riMLF) is a collection of neurons in the medial longitudinal fasciculus in the midbrain. It is responsible for mediating vertical conjugate eye movements (vertical gaze) and vertical saccades.
Source: Wikipedia — Rostral interstitial nucleus of medial longitudinal fasciculus (CC BY-SA 4.0)