title: Optic nerve distention in a cichlid fish.
mesh_terms: D000818:Animals; D005133:Eye Movements; D005399:Fishes / Q000502:physiology*; D008297:Male; D008855:Microscopy, Electron, Scanning; D009900:Optic Nerve / Q000502:physiology* / Q000648:ultrastructure; D012399:Rotation