Autonomic innervation of the smooth muscle sphincter in the swimbladder of a fish (Gadus morhua).
D000400:Air Sacs; D000818:Animals; D001341:Autonomic Nervous System / Q000502:physiology*; D005399:Fishes; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000294:innervation*; D014628:Vagotomy; D014630:Vagus Nerve / Q000502:physiology