Last summer while doing bronchoscopy on a child about 2 years of age for the removal of a foreign body from one of the branches of a main bronchus, my attention was arrested by the rhythmical dilatation and contraction of the main bronchi and their branches during inspiration and expiration. This movement was so great that in inspiration the diameter of the tube was sometimes more than twice as great as in expiration. Similar movements were shortly afterward observed in the trachea, also in another young child, although I had not observed these movements in three adults on whom I had done the operation. From this fact I surmised that the movements were not present in the larger bronchi of adults for the reason that they were prevented by the greater rigidity of the cartilages, but it seemed probable that they extended throughout the smaller bronchi at all ages. A
INGALS EF. RESPIRATORY MOVEMENTS OF THE BRONCHIAL TUBES. JAMA. 1905;XLV(18):1302–1305. doi:10.1001/jama.1905.52510180018002b
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