The arcuate nucleus as a circumventricular organ in the mouse

▶ The circumventricular organs are brain territories outside the blood-brain-barrier. ▶ Circumventricular organs host fenestrated microvessels for blood sensing. ▶ The mediobasal hypothalamus is expected to host a circumventricular organ. ▶ The mediobasal hypothalamus host fenestrated microvessels. ▶ The mediobasal hypothalamus host a circumventricular organ.