Fig. 18.Location of circumventricular organs in the rat brain. AP = area postrema, ME = median eminence, OVLT = organum vasculosum of the lamina terminalis, P = pineal gland, PP = posterior pituitary, SFO = subfornical organ. (Modified from Saper and Breder, New England Journal of Medicine 330: 1080-1886, 1994.)