Peroral endoscopy and laryngeal surgery . he carina to the left of the long axis of the trachea. 4. The action of the trachealis muscle. 5. The greater volume of air going into the riglit broiicluis on in-spiration. The first three of these factors are shown in the schema Fig. 1T1,The riglit bronchus is in size and direction the continuation of the 240 IOREIGN BODIES IN AIR AND FOOD PASSAGES. trachea; the left bronchus in many cases simulating a lateral branch ofthe trachea rather than a bifurcational half. The situation of the carinato the left of the long axis of the trachea is important. He
Peroral endoscopy and laryngeal surgery . he carina to the left of the long axis of the trachea. 4. The action of the trachealis muscle. 5. The greater volume of air going into the riglit broiicluis on in-spiration. The first three of these factors are shown in the schema Fig. 1T1,The riglit bronchus is in size and direction the continuation of the 240 IOREIGN BODIES IN AIR AND FOOD PASSAGES. trachea; the left bronchus in many cases simulating a lateral branch ofthe trachea rather than a bifurcational half. The situation of the carinato the left of the long axis of the trachea is important. Heller and\. Schrotter found the carina to the left in 57 per cent, in the middleline in -13 per cent and to the right in 1 per cent. Sir Felix Semon andMorrell Mackenzies joint results were: left, .59 per cent, middle per cent, riglit, il per cent. These statistics are all based on the cad-averic anatom)-. The author feels certain that the living anatomy showsa much more marked preponderance of left-sided situation of the Fig. I/I. Schema showing three anatomical reasons for the greater frequencyof right-sided lodgement of foreign bodies in the bronchi. The right bronchus(Rt. B.) is almost as wide ( mm.) as the trachea (24 mm.) and it deviates muchless than the left from the long axis of the trachea. The carina, C, is to the leftof this axis, (.\fter Sir St. Clair Thomson.) He regrets that he did not keep a record of this point in all of his bron-choscopic cases. But in 40 cases where he kept a record the carinaseemed more or less to the left in all but one and in that case the carinaseemed central. These cases were, without known pathology that couldalter the position of the carina. The observation is submitted with ac-knowledgment of the possibility of error, because of the alteration ofposition of all the thoracic viscera due to position of the patient, thebronchoscopic tube and the pulsatorv and resjiiratory movements. Fur-thermore, the observations were
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrespira, bookyear1915
