The bronchi and pulmonary blood-vessels : their anatomy and nomenclature with a criticism of Professor Aeby's view on the bronchial tree of mammalia and of man / by William Ewart.

  • William Ewart
Date:
1889
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Licence: Public Domain Mark

Credit: The bronchi and pulmonary blood-vessels : their anatomy and nomenclature with a criticism of Professor Aeby's view on the bronchial tree of mammalia and of man / by William Ewart. Source: Wellcome Collection.

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    1)oilbt (*) The Branched Portion, or rather that portion which is situated begins at w/ 7 L the origin below the first branch, is the only one which gives matter for doubt, of branches. The Oldest View.—So long as anatomists paid no attention to the intra- end^auho pnlmonary bronchial tree, and were content to describe the right main catix hUm'~ ^roucnus as dividing into three lobar bronchi, and the left main bronchus as dividing into two, the point did not arise for consideration. According to this oldest view the bronchus came to an end by the fact of its undergoing divi- sion. The application of the term main bronchus to either of the tubes beyond that point would have been inconsistent with the principle of dicho- tomy, then recognized. Professor Contrary View held by Professor Aeby.—With this view Professor tinues°tbe Aeby's theory is in complete opposition. Not only does he not admit so early bronchus a termination of the main bronchus. He considers that this tube is continued to the base, without losing its chief characters, as tar as the base of the lung; and he chial gives further emphasis to this opinion by employing the term bronchial stem. This expression is felicitous not alone because it avoids the obvious inconsistency in terms which would have been irnrjlied in the use of the name main bronchus, but because it asserts his rejection of the lobar principle in bronchial nomenclature. Lobation Pulmonary Lobes as a Basis of Bronchial Classification.— reacted'by According to the old style, at the point where the main bronchus came to an Aebyasa en^> eacu ^°^e was suPPuec^ with own bronchus. Perceiving the varieties, basis of which exist among mammalia in respect of lobation, and the variability of the cliissifici • • • i. tiou. lobation in each species, Professor Aeby preferred to deal with the bronchi in Seasons for their naked condition, entirely discarding- the lobes as a basis of description, especially ' I venture to uphold an opposite opinion, to which I have previously referred ((/. p. 7), and to suggest that it is wise not to dissociate the bronchi from the lungs in respect either of their study or of their nomenclature. For the special purpose of human anatomy, in its connection with surgery and medicine, the retention of the lobar basis of nomenclature is not only appropriate but indispensable. This necessity must be considered entirely apart from the theoretical question and does not bear with the slightest weight upon its solution. It constitutes a strong additional reason for upholding the use of the old terminology in these pages. The left Subdivision of Main Bronchi reconsidered.—The Left Bron- broucluis chus.—Holding fast by the lobar principle of bronchial nomenclature, we ends at its f11M] ft eagy choose between the old and the new view as to the length of bifurcation. * , the main bronchus. On the left side, at least, there is no room for ambiguity. This lung has but two lobes; and the main bronchus likewise supplies but two branches, one for each lobe. It conies to an end at the level of that bifurcation, as was formerly taught. It is therefore clear that a branched It has onlv two por- portion of the left bronchus does not exist. The latter consists of two
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