[Answer] Where is the SA node located?

Answer: Right Atrium

Most relevant text from all around the web:

Where is the SA node located? Definition of SA node Sinoatrial node - Wikipedia Internodal Pathways - RightDiagnosis.com The sinoatrial node is a banana-shaped structure that varies in size usually between 10-30 millimeters (mm) long 5–7 mm wide and 1–2 mm deep. The SA node is located in the wall (myocardium) of the right atrium laterally to the entrance of the superior vena cava in a region called the sinus venarum (hence sino- + atrial). It is positioned roughly between a groove called the crista terminalis located on the internal surface of the heart and the corresponding sulcus terminalis on the external surface. Thes… The sinoatrial node is a banana-shaped structure that varies in size usually between 10-30 millimeters (mm) long 5–7 mm wide and 1–2 mm deep. The SA node is located in the wall (myocardium) of the right atrium laterally to the entrance of the superior vena cava in a region called the sinus venarum (hence sino- + atrial). It is positioned roughly between a groove called the crista terminalis located on the internal surface of the heart and the corresponding sulcus terminalis on the external surface. These grooves run between the entrance of the superior vena cava and the inferior vena cava. The cells of the SA node are spread out within a mesh of connective tissue containing nerves blood vessels collagen and fat. Immediately surrounding the SA node cells are paranodal cells. These cells have structures intermediate between that of the SA node cells and the rest of the atrium. The connective tissue along with the paranodal cells insulate the SA node from the rest of the atrium preventing the electrical activity of the atrial cells from affecting the SA node cells. The SA node cells are smaller and paler than the surrounding atrial cells with the average cell being around 8 micrometers in diameter and 20-30 micrometers in length (1 micrometer= 0.000001 meter). Unlike the atrial cells SA node cells contain fewer mitochondria (the power plant of the cell) fewer myofibers (the contractile machinery of the cel...

Disclaimer: 

Our tool is still learning and trying its best to find the correct answer to your question. Now its your turn, "The more we share The more we have". Comment any other details to improve the description, we will update answer while you visit us next time...Kindly check our comments section, Sometimes our tool may wrong but not our users.

Are We Wrong To Think We're Right? Then Give Right Answer Below As Comment