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Sinoatrial node
Reizleitungssystem 1.png
Figure 1 shows the conduction system of the heart. The SA node is labelled 1.
Details
SystemElectrical conduction system of the heart
ArterySinoatrial nodal artery
Identifiers
Latinnodus sinuatrialis
Acronym(s)SA node
MeSHD012849
TAA12.1.06.003
FMA9477
Anatomical terminology

The sinoatrial node (also known as the SA node or the sinus node) is a group of cells located in the wall of the right atrium of the heart. These cells have the ability to spontaneously produce an electrical impulse (action potential; see below for more details), that travels through the heart via the electrical conduction system (see figure 1) causing it to contract. In a healthy heart, the SA node continuously produces action potential, setting the rhythm of the heart and so is known as the heart's natural pacemaker. The rate of action potential production (and therefore the heart rate) is influenced by nerves that supply it.

Structure