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  2. Interatrial septum - Wikipedia

    en.wikipedia.org/wiki/Interatrial_septum

    The interatrial septum forms during the first and second months of fetal development. Formation of the septum occurs in several stages. Formation of the septum occurs in several stages. The first is the development of the septum primum , a crescent-shaped piece of tissue forming the initial divider between the right and left atria.

  3. Bachmann's bundle - Wikipedia

    en.wikipedia.org/wiki/Bachmann's_bundle

    Bachmann's bundle receives its blood supply from the sinoatrial nodal artery (right, left or both). [4]Besides Bachmann's bundle, the other three conduction tracts that constitute the atrial conduction system are known as the anterior, middle, and posterior tracts, which run from the sinoatrial node to the atrioventricular node, converging in the region near the coronary sinus.

  4. Primary interatrial foramen - Wikipedia

    en.wikipedia.org/wiki/Primary_interatrial_foramen

    The septum primum, a septum which grows down to separate the primitive atrium into the left atrium and right atrium, grows in size over the course of heart development.The primary interatrial foramen is the gap between the septum primum and the septum intermedium, which gets progressively smaller until it closes.

  5. Fossa ovalis (heart) - Wikipedia

    en.wikipedia.org/wiki/Fossa_ovalis_(heart)

    The fossa ovalis is a depression in the right atrium of the heart, at the level of the interatrial septum, the wall between right and left atrium.The fossa ovalis is the remnant of a thin fibrous sheet that covered the foramen ovale during fetal development.

  6. Atrioventricular node - Wikipedia

    en.wikipedia.org/wiki/Atrioventricular_node

    The blood supply of the AV node is from the atrioventricular nodal branch.The origin of this artery is most commonly (80–90% of hearts) a branch of the right coronary artery, with the remainder originating from the left circumflex artery.

  7. Bundle of His - Wikipedia

    en.wikipedia.org/wiki/Bundle_of_His

    The bundle of His (BH) [1]: 58 or His bundle (HB) [1]: 232 (/ h ɪ s / "hiss" [2]) is a collection of heart muscle cells specialized for electrical conduction.As part of the electrical conduction system of the heart, it transmits the electrical impulses from the atrioventricular node (located between the atria and the ventricles) to the point of the apex of the fascicular branches via the ...

  8. Valve of inferior vena cava - Wikipedia

    en.wikipedia.org/wiki/Valve_of_inferior_vena_cava

    Occasionally, the eustachian valve crosses the floor of the right atrium from the orifice of the IVC and inserts into the lower portion of the interatrial septum adjacent to the atrioventricular valves. [2] However, higher insertion of a giant eustachian valve, which mimics the echocardiographic appearance of divided right atrium, is very rare.

  9. Koch's triangle - Wikipedia

    en.wikipedia.org/wiki/Koch's_triangle

    The base is formed by the coronary sinus orifice and the vestibule of the right atrium, and the hypotenuse is formed by the tendon of Todaro, which is often a continuation off the Eustachian valve. Other structures near to it are the membranous septum and the Eustachian ridge. Variations in the size of Koch's triangle are common.