Hypertropia is related to hypotropia and fourth cranial nerve palsy. An important gene associated with Hypertropia is KIF21A (Kinesin Family Member 21A), and among its related pathways/superpathways are Development Slit-Robo signaling and Intraflagellar transport. The drugs Acetylcholine and Cholinergic Agents have been mentioned in the context of this disorder. Affiliated tissues include eye and thyroid, and related phenotype is respiratory system.