This review brings up to date material on the pulm'J:iary receptors with vagal afferent fibers. There a:·e essentially three typs of pulmonary receptors, 1) pulmonary stretch receptors, 2) irritant receptors, 3) type J pulmonary receptors. Their location, natu- 1 al stimulus, excitatory stimulus, reflex effects ancl their responses to chemical substances for three kind of recptas a,e discussed...