Tags: Anatomical Structure.
The terminal sulcus is a groove in the right atrium of the heart. The terminal sulcus marks the separation of the right atrial pectinate muscle from the sinus venarum. The terminal sulcus extends from the front of the superior vena cava to the front of the inferior vena cava and represents the line of union of the sinus venosus of the embryo with the primitive atrium.