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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.


A – Sub-type IIa of the septomarginal trabecula: a) horizontal cross-section through the lumen of the right ventricle; b) sagittal cross-section through the lumen of the right ventricle. B – Interior of the right ventricle; sub-type IIa of the septomarginal trabecula (♀ 51 yrs)IS – interventricular septum, AW – anterior wall of the right ventricle, ST – septomarginal trabecula, APM – anterior papillary muscle, SC – lower part of the crista supraventricularis, I in black circle – septomarginal trabecula
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Figure 7: A – Sub-type IIa of the septomarginal trabecula: a) horizontal cross-section through the lumen of the right ventricle; b) sagittal cross-section through the lumen of the right ventricle. B – Interior of the right ventricle; sub-type IIa of the septomarginal trabecula (♀ 51 yrs)IS – interventricular septum, AW – anterior wall of the right ventricle, ST – septomarginal trabecula, APM – anterior papillary muscle, SC – lower part of the crista supraventricularis, I in black circle – septomarginal trabecula

Mentions: Type II of the trabecula was characterized by a contiguous connection of the anterior papillary muscle with the studied structure or a firm, variably advanced consolidation of both elements. Thus, the distal segment of the septomarginal trabecula partially connected with the anterior papillary muscle and partially with the anterior wall of the right ventricle. The proportions were highly variable among individuals. Thirteen out of 60 hearts of fetuses (21.06%), 9 out of 60 hearts of children (15%) and 8 out of 100 hearts of adults (8%) were included in this type. Considering the degree of consolidation of those structures, two sub-types were distinguished within this group. Sub-type IIa, determined by the trabecula adjoining the muscle (Figure 7), was observed in 4 fetuses (30.77% of type II group), 3 children (33.33%) and 7 adults (87.5%). Sub-type IIb was characterized by a partial consolidation of the septomarginal trabecula and the anterior papillary muscle, while the remaining segment of the trabecula reached the anterior wall of the ventricle (Figure 4B). Such a phenomenon could be observed in 9 fetuses (69.23%), 6 children (66.66%) and 1 adult (12.5%).


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)

A – Sub-type IIa of the septomarginal trabecula: a) horizontal cross-section through the lumen of the right ventricle; b) sagittal cross-section through the lumen of the right ventricle. B – Interior of the right ventricle; sub-type IIa of the septomarginal trabecula (♀ 51 yrs)IS – interventricular septum, AW – anterior wall of the right ventricle, ST – septomarginal trabecula, APM – anterior papillary muscle, SC – lower part of the crista supraventricularis, I in black circle – septomarginal trabecula
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 7: A – Sub-type IIa of the septomarginal trabecula: a) horizontal cross-section through the lumen of the right ventricle; b) sagittal cross-section through the lumen of the right ventricle. B – Interior of the right ventricle; sub-type IIa of the septomarginal trabecula (♀ 51 yrs)IS – interventricular septum, AW – anterior wall of the right ventricle, ST – septomarginal trabecula, APM – anterior papillary muscle, SC – lower part of the crista supraventricularis, I in black circle – septomarginal trabecula
Mentions: Type II of the trabecula was characterized by a contiguous connection of the anterior papillary muscle with the studied structure or a firm, variably advanced consolidation of both elements. Thus, the distal segment of the septomarginal trabecula partially connected with the anterior papillary muscle and partially with the anterior wall of the right ventricle. The proportions were highly variable among individuals. Thirteen out of 60 hearts of fetuses (21.06%), 9 out of 60 hearts of children (15%) and 8 out of 100 hearts of adults (8%) were included in this type. Considering the degree of consolidation of those structures, two sub-types were distinguished within this group. Sub-type IIa, determined by the trabecula adjoining the muscle (Figure 7), was observed in 4 fetuses (30.77% of type II group), 3 children (33.33%) and 7 adults (87.5%). Sub-type IIb was characterized by a partial consolidation of the septomarginal trabecula and the anterior papillary muscle, while the remaining segment of the trabecula reached the anterior wall of the ventricle (Figure 4B). Such a phenomenon could be observed in 9 fetuses (69.23%), 6 children (66.66%) and 1 adult (12.5%).

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.