The term humerosensory system refers to one of seven subcortical sensory systems of the cerebrospinal trunk. It consists of three of the circumventricular organs classified on the basis of function; they detect blood-borne substances and send neural signals to other brain structures. They include the organum vasculosum, the subfornical organ and the area postrema ( Duvernoy-2007 ). The other circumventricular organs are classified as secretory circumventricular organs.