Physiological Anatomy of the Lungs

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                                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
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Physiological Anatomy of the Lungs, 1860. From The Royal Society, AP/43/4

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