sinoatrial node

The part of the cardiac conduction system that controls the timing of heart muscle contraction. It relays electrical signals to the AV node[GO]. Subdivision of conducting system of heart at the junction of the right atrium and the superior vena cava, around the sinoatrial nodal branch of right coronary artery and is continuous with the internodal tract[FMA]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the sinoatrial node is

The part of the cardiac conduction system that controls the timing of heart muscle contraction. It relays electrical signals to the AV node[GO]. Subdivision of conducting system of heart at the junction of the right atrium and the superior vena cava, around the sinoatrial nodal branch of right coronary artery and is continuous with the internodal tract[FMA]. The atlas records it as a tissue at the tissue scale in the human body.

Where the sinoatrial node is

It sits in the thorax and trunk, within the muscular and cardiovascular systems. Positioned deliberately as part of this species body plan.

What the sinoatrial node connects to

The atlas records 5 typed relationships for it, across 3 kinds of connection. part of conducting system of heart and right cardiac atrium.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the sinoatrial node. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as Koch's node, SA nodal muscle tissue, SA node, cardiac pacemaker, node of Keith-Flack and nodus sinuatrialis, and 6 more. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0002351, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: conducting system of heart and right cardiac atrium.
• A kind of: cardiac muscle of right atrium and conducting tissue of heart.
• contributes to morphology of: conducting system of heart.

Questions

Where is the sinoatrial node?

It sits in the thorax and trunk, within the muscular and cardiovascular systems. Positioned deliberately as part of this species body plan.

What does the sinoatrial node connect to?

Part of: conducting system of heart and right cardiac atrium.

Is the sinoatrial node the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.