The<unk>  <unk>  is one of the circumventricular<unk> s of the brain. Its name comes from its location on the ventral surface of the fornix near the interventricular foramina (foramina of Monro), which interconnect the lateral ventricles and the third ventricle. Like all circumventricular<unk> s, the<unk>  is well-vascularized, and like all circumventricular<unk> s except the subcommissural<unk> , some<unk>  capillaries have fenestrations, which increase capillary permeability. The<unk>  is considered a sensory circumventricular<unk>  because it is responsive to a wide variety of hormones and neurotransmitters, as opposed to secretory circumventricular<unk> s, which are specialized in the release of certain substances.
Subfornical organ
Stellate ganglion
Meibomian gland
Olfactory trigone
Syrinx 
Medulla 
Medulla
Aorticorenal ganglion