Variations in the number and attachment of papillary muscles

Radhakrishnan, N S (2009) Variations in the number and attachment of papillary muscles. Masters thesis, Stanley Medical College, Chennai.

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Abstract

The variations in the papillary muscular anatomy is studied in a detailed manner in 100 human hearts. The results are more or less coinciding with that of the other studies done by eminent scientists in the field. The following findings have been observed ; The left ventricle had showed two papillary muscles in most of the specimen studied; they arise from the anterolateral wall and posteromedial wall and each of them sends chordae tendinae to both cusps of mitral valve. The anterior papillary muscle is largest of the papillary muscle; it had single belly in seventy one percent (71%), and that was the predominant pattern observed, more than one belly was observed in the remaining twenty nine percent of specimens studied. The anterior papillary muscle seen arising from upper third in sixteen percent (16%), from the middle third in seventy four percent (74%) and from the lower third in ten percent (10%). The posterior papillary muscle was found to be having single belly in forty nine percent(49%), more than one belly in the remaining fifty one percent of the specimens studied, so in the case of posterior muscle the pattern of having more than one belly was the more frequent finding. The posterior papillary muscle was seen arising from the upper third in thirteen percent (13%), from the middle third in eighty one percent (81%), and from the lower third in six percent (6%) of the specimen studied. In the right ventricle there was larger anterior papillary muscle which was having single belly in sixty eight percent(68%) and more than one belly in the remaining thirty two percent of the specimens. The posterior muscle was having predominant pattern of having two bellies which were smaller in dimension compared to the anterior papillary muscle, the percentage having two bellies was fifty three (53%). The septal muscle was the most inconstant one and was absent in as many as forty nine(49%) percent of the specimens studied. The attachment of the base of the anterior and posterior papillary muscles was in the middle third mostly ;in eighty three percent (83%) for anterior and eighty eight percent (88%) for posterior muscle, but in septal papillary muscle the upper third attachment predominate that was in fifty eight percent (58%). The chordae tendinae arising from each of the papillary muscle seen varying to a great extent , it was found to be numerous from the anterior papillary muscle of the left ventricle which showed an average of eight and the least from the posterior muscle of the right ventricle which showed an average of two.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Variations, number, attachment, papillary muscles.
Subjects: MEDICAL > Anatomy
Depositing User: Subramani R
Date Deposited: 05 Oct 2019 05:13
Last Modified: 05 Oct 2019 05:13
URI: http://repository-tnmgrmu.ac.in/id/eprint/11680

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