 This observation was comparatively neglected until Jarisch and Henze re-examined it in 1937; they identified the reaction as a chemoreflex acting "via" the vagus nerve that was relayed in the nucleus tractus solitarii (NTS), and termed it the Bezold reflex.It is now usually called the Bezold–Jarisch reflex; however the cardiac bradycardia and hypopnea arise from anatomically distinct receptors in the heart and lung respectively and whether hypopnea should be regarded as part of the reflex is disputed.The afferent cardiac neurons relevant to the Bezold–Jarisch reflex have cell bodies in the nodose ganglion and the dorsal root ganglion.