
the statement that there was either a dichotomous or a trichotomous division of the Bronchial tube. Even the so-called 'bifurcation' of the Trachea which is the nearest approach to such an ar= =rangement that is anywhere to be found, is not a true binary division. The left Bronchus is much <s>short<\s> smaller than the right and is given off as a separate branch from the main stem of the windpipe and it is not a true bificurcation. In all quadrupeds, the trachea previous to reaching the point where it is ordi= =narily said to <s>divide<\s> 'bifurcate', gives off a separate and distinct branch of considerable size to the upper lobe of the <s>left<\s> right lung. This upper lobe has a sort of peninsula attached to it, so as to cause the right lung to project higher in the neck of those animals than the left does. If the first division of the trachea be entitled to the name of 'bifurcation' this bronchial tube which in the sheep takes its origin nearly two inches above that which ordinarily goes by that name, ought to be considered as forming a part of the bifurcation rather than that which in point of fact, is the second branch given off from
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Manuscript details
- Author
- James Newton Heale
- Reference
- AP/43/4
- Series
- AP
- Date
- 1860
- IIIF
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Cite as
Physiological Anatomy of the Lungs, 1860. From The Royal Society, AP/43/4
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