Physiological Anatomy of the Lungs

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                                the wind passage. The division of the Bronchial 
tubes however instead of being either dichotomous 
or trichotomous in any part of the lungs, is strictly that of a panicle - 
In every part a straight diminishing tube 
may be discovered, which strictly resembles the 
mid-rib of a leaf, and from this branches are 
given off alternately on each side of it, throughout 
its whole length - Each of these secondary 
branches follow out precisely the same plan 
of distribution and this continues to be repeated 
down to the ultimate terminations of the minutest 
Bronchial tubes - The drawings in Series A 
No 1 shews the so called 'bifurcation' of the trachea 
in the human lung, from which it will be seen 
that the left Bronchus is merely a branch given 
off from the mainstem of the windpipe, and 
does not constitute a binary division - 
A drawing in Series A No 2 exhibits the 
branch, which is given off in the sheep's lung 
to the upper lobe of the right lung, previous to the 
left Bronchus leaving the trachea, and in this 
case (as universally prevails in quadrupeds) the 
left Bronchus is the second branch given off from the trachea - 
                            
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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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