[Neural regulation of bronchial smooth muscle]

A brief account of the anatomical features of the smooth musculature of the entire bronchial tree is followed by an examination of the various components of the broncho-constrictor reflex. Stress is laid on the importance of the sympathetic and parasympathetic pathways in determining the reflex and the release of chemical mediators in the bronchi is discussed. Clinical situations leading to an enhanced reflex are described and their pathogenesis is explained. It is submitted, however, that existing knowledge of bronchospastic syndromes is still insufficiently clear. This explains the lack of success frequently encountered in their treatment.