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Morphogenetic aspects of the septomarginal trabecula in the human heart.

Kosiński A, Kozłowski D, Nowiński J, Lewicka E, Dąbrowska-Kugacka A, Raczak G, Grzybiak M - Arch Med Sci (2010)

Bottom Line: In most cases the trabecula originated from the upper part of the interventricular septum, separating at an angle increasing proportionally to the number of branches of the crista supraventricularis as well as the number of secondary trabeculae.The most common was type III, the undivided trabecula, tightly connecting with the anterior papillary muscle.Based on the results of the following study we propose a hypothesis on the genesis of respective parts of the septomarginal trabecula and a plausible sequence of changes they undergo during human ontogenesis and phylogenesis of the primates.

View Article: PubMed Central - PubMed

Affiliation: Department of Clinical Anatomy, Medical University of Gdansk, Poland.

ABSTRACT

Introduction: The septomarginal trabecula is a constant element of the anatomy of the human heart, which connects the interventricular septum and the anterior wall of the right ventricle. Considering the diversity of opinions about the structure and numerous studies suggesting its important role in haemodynamics and conduction of electrical impulses in the heart, we decided to study this element in detail.

Material and methods: The research was conducted on 220 human hearts. Attention was mainly paid to the structure and topography of the trabecula. Its relation to the anterior papillary muscle was also a part of the study.

Results: The presence of this morphologically diverse element was confirmed in each of the studied hearts. In most cases the trabecula originated from the upper part of the interventricular septum, separating at an angle increasing proportionally to the number of branches of the crista supraventricularis as well as the number of secondary trabeculae. The criteria established for the study, which included the course of the trabecula in the lumen of the right ventricle and its relation to the anterior papillary muscle, let us distinguish 4 types of septomarginal trabecula (I, II, III, IV). The most common was type III, the undivided trabecula, tightly connecting with the anterior papillary muscle.

Conclusions: Based on the results of the following study we propose a hypothesis on the genesis of respective parts of the septomarginal trabecula and a plausible sequence of changes they undergo during human ontogenesis and phylogenesis of the primates.

No MeSH data available.


The angle of the septomarginal trabecula branching from the interventricular septum, between the long axis of the trabecula and the long axis of the crista supraventricularisSC – lower part of the crista supraventricularis, ST (I) – septomarginal trabecula
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Figure 1: The angle of the septomarginal trabecula branching from the interventricular septum, between the long axis of the trabecula and the long axis of the crista supraventricularisSC – lower part of the crista supraventricularis, ST (I) – septomarginal trabecula

Mentions: The incision ran from the apex of the right ventricle, along its lateral margin, and through the posterior leaflet of the tricuspid valve. Then, the right atrium was opened along the lower margin of the auricle. After opening the ventricle, its interior was carefully inspected. A binocular magnifying glass was used to study the hearts obtained from fetuses and small children. Special attention was paid to the shape of the septomarginal trabecula. The subject of analysis included the angle between the moderator band and interventricular septum (located between the longitudinal axis of the trabecula and the longitudinal axis of the crista supraventricularis – Figure 1). The hearts were divided into three groups depending on the value of the angle. In the first group (A) the angle ranged from 0 to 30 degrees, in the second (B) from 31 to 60 degrees, and in the third (C) from 61 to 90 degrees (Figure 2A).


Morphogenetic aspects of the septomarginal trabecula in the human heart.

Kosiński A, Kozłowski D, Nowiński J, Lewicka E, Dąbrowska-Kugacka A, Raczak G, Grzybiak M - Arch Med Sci (2010)

The angle of the septomarginal trabecula branching from the interventricular septum, between the long axis of the trabecula and the long axis of the crista supraventricularisSC – lower part of the crista supraventricularis, ST (I) – septomarginal trabecula
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3298343&req=5

Figure 1: The angle of the septomarginal trabecula branching from the interventricular septum, between the long axis of the trabecula and the long axis of the crista supraventricularisSC – lower part of the crista supraventricularis, ST (I) – septomarginal trabecula
Mentions: The incision ran from the apex of the right ventricle, along its lateral margin, and through the posterior leaflet of the tricuspid valve. Then, the right atrium was opened along the lower margin of the auricle. After opening the ventricle, its interior was carefully inspected. A binocular magnifying glass was used to study the hearts obtained from fetuses and small children. Special attention was paid to the shape of the septomarginal trabecula. The subject of analysis included the angle between the moderator band and interventricular septum (located between the longitudinal axis of the trabecula and the longitudinal axis of the crista supraventricularis – Figure 1). The hearts were divided into three groups depending on the value of the angle. In the first group (A) the angle ranged from 0 to 30 degrees, in the second (B) from 31 to 60 degrees, and in the third (C) from 61 to 90 degrees (Figure 2A).

Bottom Line: In most cases the trabecula originated from the upper part of the interventricular septum, separating at an angle increasing proportionally to the number of branches of the crista supraventricularis as well as the number of secondary trabeculae.The most common was type III, the undivided trabecula, tightly connecting with the anterior papillary muscle.Based on the results of the following study we propose a hypothesis on the genesis of respective parts of the septomarginal trabecula and a plausible sequence of changes they undergo during human ontogenesis and phylogenesis of the primates.

View Article: PubMed Central - PubMed

Affiliation: Department of Clinical Anatomy, Medical University of Gdansk, Poland.

ABSTRACT

Introduction: The septomarginal trabecula is a constant element of the anatomy of the human heart, which connects the interventricular septum and the anterior wall of the right ventricle. Considering the diversity of opinions about the structure and numerous studies suggesting its important role in haemodynamics and conduction of electrical impulses in the heart, we decided to study this element in detail.

Material and methods: The research was conducted on 220 human hearts. Attention was mainly paid to the structure and topography of the trabecula. Its relation to the anterior papillary muscle was also a part of the study.

Results: The presence of this morphologically diverse element was confirmed in each of the studied hearts. In most cases the trabecula originated from the upper part of the interventricular septum, separating at an angle increasing proportionally to the number of branches of the crista supraventricularis as well as the number of secondary trabeculae. The criteria established for the study, which included the course of the trabecula in the lumen of the right ventricle and its relation to the anterior papillary muscle, let us distinguish 4 types of septomarginal trabecula (I, II, III, IV). The most common was type III, the undivided trabecula, tightly connecting with the anterior papillary muscle.

Conclusions: Based on the results of the following study we propose a hypothesis on the genesis of respective parts of the septomarginal trabecula and a plausible sequence of changes they undergo during human ontogenesis and phylogenesis of the primates.

No MeSH data available.