Sinoatrial node
Sinoatrial node (also known as SA node) is the natural pacemaker of the heart. It is a group of cells positioned on the wall of the right atrium, near the entrance of the superior vena cava. These cells are responsible for initiating each heartbeat.
Anatomy[edit | edit source]
The SA node is located in the superior part of the right atrium, near the opening of the Superior vena cava. It is a crescent-shaped structure that measures approximately 3 mm in width, 15 mm in length, and 1 mm in thickness.
Function[edit | edit source]
The primary function of the SA node is to generate electrical impulses that initiate the heartbeat. These impulses are then transmitted to the atrioventricular (AV) node, which serves as a gateway to the ventricles.
Clinical significance[edit | edit source]
Dysfunction of the SA node can lead to various arrhythmias, such as sinus bradycardia, sinus tachycardia, and sick sinus syndrome. Treatment options for SA node dysfunction include medication and the implantation of a pacemaker.
See also[edit | edit source]
References[edit | edit source]
| Sinoatrial node Resources | ||
|---|---|---|
|
| |
Navigation: Wellness - Encyclopedia - Health topics - Disease Index - Drugs - World Directory - Gray's Anatomy - Keto diet - Recipes
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD
WikiMD is not a substitute for professional medical advice. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.
Translate this page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
Contributors: Prab R. Tumpati, MD
