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22 paź 2021 · Atrial septation begins with the appearance of a thin crescent ridge of connective tissue that grows from the atrial roof and is called septum primum (SP). The free edge of the SP is covered by mesenchymal cells (mesenchymal cup).
Clinical anatomy of the atrial septum with reference to its developmental components. Clin Anat 1999;12:362–74. A review of the structure of the atrial septum, emphasising that the so-called “septum secundum” is no more than an infolding of the atrial roof.
The atrial septum is obliquely orientated extending from the right posterior to left anterior position. When viewed from the RA aspect, the atrial septum is characterized by a muscular rim - the limbus - which surrounds the thin flap valve of the oval fossa .
18 lut 2018 · This article reviews the developmental aspects of the partitioning of the primitive atrium into right and left atrial chambers, the anatomical components of the atrial septum, and deficiencies that produce the various types of interatrial communications.
18 paź 2018 · We then show that the key mesenchymal and myocardial elements of the primary atrial septum can be traced back in evolution to lungfishes and that these tissues form the basis for incomplete and complete atrial septation in all tetrapods (amphibians, reptiles, birds, and mammals).
Abstract. The interatrial septum (IAS), a fibromuscular structure separating the right (RA) and left (LA) atrium, plays an important role in both intra- and interatrial conduction. Electropathological changes in the IAS such as discordant activation of the right and left septal layer and conduction disorders may facilitate intraseptal re-entry ...
30 paź 2023 · The interatrial septum is a thin fibromuscular wall situated between the right and left atria of the heart. In adults, the interatrial septum has a centrally positioned depression known as oval fossa. This depression marks the place where foramen ovale was placed during fetal development.
