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The membranous portion of the interventricular septum and its relationship with the aortic valve in humans
G Teofilovski-Parapid1, C A Baptista, L J DiDio
1Institute of Anatomy, School of Medicine, University of Beograde, Yugoslavia.
Abstract:
Investigation of the membranous portion of the interventricular septum (MPIS) and its relationship with the aortic valve was performed in 32 human hearts of adult individuals (19 Caucasians and 11 non-Caucasians). With transillumination of the MPIS the specimens were photographed and 35 mm slices obtained. These were digitized into Apple Macintosh II using a Dage Model 68 video camera and a Data Translations DT 2255 frame grabber. The areas and the distances were traced manually, using the NIH Image program (Wayne Rasband, NIH, Research Services Branch, NIHM). The following forms of MPIS were found: oval (31.3%), triangular (28.1%), quadrangular (18.8%), circular (15.6%) and semilunar (6.2%); its surface area varied from 5.65 mm2 to 142.63 mm2 (mean 48.82 +/- 29.17 mm2). The superior border of the MPIS was in close relationship with the aortic valve, and its upper part was usually (41%) in direct continuity with the attachments of both right (RAC) and posterior (PAC) aortic cusps, or with PAC (34%) or RAC (6%) only. Rarely (19%) the MPIS lay below the attachments of both cusps. The distance between the MPIS superior border and the attachment of the RAC was not greater than 5.89 mm (mean 1.69 mm +/- 1.9 mm). The distance between the superior border of the MPIS and the attachment of the PAC was not greater than 5.63 mm (mean 0.77 +/- 1.49 mm). Differences between sex, race and age groups were not statistically significant.
Insights
The membranous portion of the interventricular septum (MPIS) frequently connects with aortic valve cusps. Understanding this relationship is crucial for cardiac anatomy and surgical considerations.
Area of Science:
- Cardiovascular Anatomy
- Cardiac Morphology
Background:
- The membranous portion of the interventricular septum (MPIS) is a critical structure in the heart.
- Its precise anatomical relationship with the aortic valve is essential for understanding cardiac function and potential pathologies.
Purpose of the Study:
- To investigate the morphology of the MPIS.
- To determine the spatial relationship between the MPIS and the aortic valve in human hearts.
Main Methods:
- Examination of 32 adult human hearts.
- Photographic documentation and digital image analysis of MPIS morphology and dimensions.
- Manual tracing and measurement using NIH Image software.
Main Results:
- MPIS exhibited various shapes including oval, triangular, and quadrangular.
- The mean surface area of the MPIS was 48.82 mm².
- The superior border of the MPIS was often continuous with the aortic valve cusps (right and posterior aortic cusps).
- Distances between the MPIS superior border and aortic cusp attachments were minimal (mean 1.69 mm to RAC, 0.77 mm to PAC).
Conclusions:
- The MPIS demonstrates significant morphological variability.
- A close anatomical proximity exists between the MPIS and the aortic valve attachments.
- These findings are important for cardiac surgeons and anatomists.