Embryology - 26 Apr 2024 Expand to Translate
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Frazer JE. The Formation of the Pars Membranacea Septi. J Anat. 1916 Oct;51(Pt 1):19-29. PMID 17103800

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The Formation of the Pars Membranacea Septi

By

J. Ernest Frazer, F.R.C.S., St Mary’s Hospital, Professor of Anatomy in the University of London.

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 right auricle from the cavity of the aortic vestibule; it cannot therefore be considered as merely a part of a structural system, more or less simple, which divides the heart into right and left sides, for the aortic vestibule is formed to the right of the plane of the interventricular septum, and is associated with the region of the earlier bulb.

Some little time ago it was suggested to me by Sir John Broadbent that a series of models showing the main points in cardiac development would be of value in demonstrating to clinical students the bearing of these points on certain lesions of the organ. I undertook to make such a series, and used the sections of embryos of 5 mm. and upwards which I possess, in the work. Many of the models were so cut up in endeavouring to follow the development as exemplified in them that they were useless for subsequent demonstration : this, however, caused me little regret, for I had determined at an early stage that the purpose with which the work had been undertaken would be served best by constructing “schematic” models——made with a free hand, founded on the actual reconstructions, but only showing the general and main conditions, so that they would bear to the real models the same relation that a scheme or diagram on paper bears to the structure or conception of which it is used as an illustration of some particular aspect or condition. Anyone who has worked with reconstruction models of the heart will agree, I think, that they are very diﬂicult to read, after the earlier stages, owing to the rapidly growing complexity of detail and inability to see more than a small part of each cavity at once, and such models would certainly be quite useless for the purpose of teaching students.

The subject of the present paper presented itself as an important one early in the Work, because it seemed that clear-cut ideas on the formation of the region were necessary for a proper understanding of development in the immediate neighbourhood. Three of the schematic models illustrate this subject, and I propose to utilise the plan of their construction in the

Cite this page: Hill, M.A. (2024, April 26) Embryology Paper - The Formation of the Pars Membranacea Septi. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_Formation_of_the_Pars_Membranacea_Septi

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