Question

what is the dot/circle in the middle of sulcus terminalis called as?​

Answer 1

Explanation:

The sulcus terminalis overlies the location of the sinoatrial (SA) node in the musculature of the crista terminalis near the orifice of the SVC. The crista terminalis originates at the interatrial grove posterior to the ascending aorta where its fibers coalesce with those of the Bachmann bundle.