WHILE anatomic and physiologic studies cannot always be applied immediately on a clinical basis, it nevertheless is important that these observations are made and recorded. With this information available the clinician often is guided in his investigations and observations.
PHYSIOLOGY OF TRACHEOBRONCHIAL TREE
Although generally conceded that the nose is an effective air cleanser, particles of dust do get beyond this into the peripheral portion of the lung. This brought up the question to Hilding and Hilding1 whether there is any other air cleanser lower in the tract. They made a study of measurements on the bronchial tree using lungs removed at necropsy.They found that there is a small progressive increase in the volume of the tracheobronchial tree from the larynx to the bronchi, measuring 1.5 mm. in diameter. The increase is from 50 to 100 per cent. In this portion of the tree there does not seem to
PUTNEY FJ, O'KEEFE JJ, CLERF LH. PERORAL ENDOSCOPY. Arch Otolaryngol. 1950;52(2):288–319. doi:10.1001/archotol.1950.00700030309018
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