Physiological Anatomy of the Lungs

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                                through these two latter surfaces only and are 
never seen, even in the smallest fragment of the 
lung to penetrate its structure through that 
part which represents the upper or convex surface 
Interior 
of the lungs
Passing to the interior of the lungs, the 
first point to engage attention is the dis=
=tribution of the Bronchial tubes - 
Bronchial 
tubes 
In ordinary anatomical works it is common 
to find it asserted that the Bronchial tubes divide 
successively in pairs: that is to say, that the trachea 
having what is called 'bifurcated', the tubes continue 
again and again to split into two in a similar 
manner - This statement has been almost 
universally repeated until quite recently, when a 
fresh author, desiring to be more exact than his 
predecessors innovates so far as to assert that 
some of the smaller tubes, instead of dividing 
in a binary manner merge into a trichotomous 
arrangement. It is singular that announcements 
of this kind should continue to be repeated, when 
the most cursory examination is sufficient to 
prove their erroneousness. There is in truth 
nothing in any part of the lungs, which would warrant 
                            
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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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