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| | #REDIRECT [[Paper - The Formation of the Pars Membranacea Septi (1916)]] |
| Frazer JE. [[Paper - The Formation of the Pars Membranacea Septi|The Formation of the Pars Membranacea Septi]]. J Anat. 1916 Oct;51(Pt 1):19-29. PMID 17103800
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| {{Historic Disclaimer}}
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| =The Formation of the Pars Membranacea Septi=
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| By
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| J. Ernest Frazer, F.R.C.S., St Mary’s Hospital, Professor of Anatomy in the University of London.
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| THE pars membranacea is not only the thinnest portion of the interventricular septum, but is also in part of its extent a structure separating the
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| right auricle from the cavity of the aortic vestibule; it cannot therefore be
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| considered as merely a part of a structural system, more or less simple,
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| which divides the heart into right and left sides, for the aortic vestibule is
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| formed to the right of the plane of the interventricular septum, and is
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| associated with the region of the earlier bulb.
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| Some little time ago it was suggested to me by Sir John Broadbent that
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| a series of models showing the main points in cardiac development would
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| be of value in demonstrating to clinical students the bearing of these points
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| on certain lesions of the organ. I undertook to make such a series, and
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| used the sections of embryos of 5 mm. and upwards which I possess, in the
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| work. Many of the models were so cut up in endeavouring to follow the
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| development as exemplified in them that they were useless for subsequent
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| demonstration : this, however, caused me little regret, for I had determined
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| at an early stage that the purpose with which the work had been undertaken would be served best by constructing “schematic” models——made
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| with a free hand, founded on the actual reconstructions, but only showing
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| the general and main conditions, so that they would bear to the real models
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| the same relation that a scheme or diagram on paper bears to the structure
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| or conception of which it is used as an illustration of some particular aspect
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| or condition. Anyone who has worked with reconstruction models of the
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| heart will agree, I think, that they are very diflicult to read, after the
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| earlier stages, owing to the rapidly growing complexity of detail and
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| inability to see more than a small part of each cavity at once, and such
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| models would certainly be quite useless for the purpose of teaching
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| students.
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| The subject of the present paper presented itself as an important one
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| early in the Work, because it seemed that clear-cut ideas on the formation
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| of the region were necessary for a proper understanding of development in
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| the immediate neighbourhood. Three of the schematic models illustrate
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| this subject, and I propose to utilise the plan of their construction in the
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| {{Footer}}
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| [[Category:Heart]][[Category:1910's]]
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