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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