Structures
- Sinus Venarum: smooth-walled portion that surrounds the opening of the superior and inferior vena cava and the coronary sinus.
a.This region is the embryological remnant of venous blood vessels that were absorbed into the formation of the right atrial wall - Openings of three vessels:
a. Superior Vena Cava
b. Inferior Vena Cava
c. Coronary Sinus - Pectinate muscles (musculi pectinati): muscular wall of the atria
- Right auricle: pouch-like extension of the muscular part (pectinate muscles) of the right atrium
- Crista terminalis: a ridge separating the muscular and smooth walled parts of the right atrium
- Interatrial septum: separates right atrium from left atrium
- a. Fossa Ovalis, represents the closure of an opening that was present within the interatrial septum of the fetal heart (normal) and was called the foramen ovale
- i. Fossa ovalis, a depression that looks like "thumb print" within the interatrial wall
7. Tricuspid valve: Its superior surface is from the right atrium
Read more about this topic: Right Atrium
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