Book - Contributions to Embryology Carnegie Institution No.38

From Embryology

A Morphological Study Of The Tracheal And Bronchial Cartilages

By William Snow Miller,

Professor of Anatomy, University of Wisconsin.

With two plates and eleven text-figures.

Links: Carnegie Institution of Washington - Contributions to Embryology


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Introduction

Horner, writing in 1839, said that "at the orifice of each branch of the bronchia there is a semi-circular cartilage, forming rather more than one-half of its circumference and having its concave edge upwards. The whole arrangement resembles somewhat the pasteboard of an eared bonnet, and is evidently to keep the orifice open." Passing over his reference to the feminine fashions of his day, we find in the above quotation the earliest description of the form of the cartilages found at the place where bronchi divide; moreover, a reason is assigned for the particular form of the cartilage.


In 1840 Jonas Iving published a short article "On the forms of the cartilages which keep open the principal divisions of the bronchial tubes." In a footnote he frankly gives the priority of description to Professor Horner and intimates that his paper was inspired by a demonstration Professor Horner made in Philadelphia to Mr. T. Wilkinson King "some months previous to the last edition of his work." Mr. King must have, on his return to London, imparted the information thus acquired to his namesake, who at once made it the subject of a special study. Iving found, however, that not all the cartilages present at the place where a bronchus divides had the characteristic saddle shape described by Horner but, "that a considerable number of varieties will be met wdth." His paper is illustrated with several small and unsatisfactory drawings of the cartilages.


An extended search of the literature fails to bring to light any other investigation of the form of the tracheal or bronchial cartilages ; in no place has the author been able to find the cartilages illustrated in plastic form, and such illustrations as are found show the cartilages as irregular plates and are evidently schematic.


Henle's illustrations are poor, but his description is fairly good. He describes the cartilages as having the plates or strips sometimes with short prolongations, arranged, as a rule, transverse to the long axis of the bronchi; they vary also have a longitudinal or oblique direction —

" Je tiefer hinab, um so mehr reduciren sie sich und um so weiter riicken sie aus einander, bis sie endlich nur noch als platte Ringe oder HalbrLnge um die Miindungen der Seitenzweige und als Stiitzen der die beiden Aeste einer gabligen Theilung trennenden Scheidewand vorkommen."


Links: Carnegie Institution of Washington - Contributions to Embryology

Illustrations

Miller Links: Plate 1 | Plate 2 | Contribution No.38 | Volume IX | Contributions to Embryology


Plate 1

Miller1920 Plate 1.jpg

Plate 2

Miller1920 Plate 2.jpg



Content to be added----


Historic Disclaimer - information about historic embryology pages 
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)


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Cite this page: Hill, M.A. (2024, March 29) Embryology Book - Contributions to Embryology Carnegie Institution No.38. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Book_-_Contributions_to_Embryology_Carnegie_Institution_No.38

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G