heart valve anatomy

This image shows the "pacemaker" (S.A. Node) of the heart.That pacemaker is a nervous bundle that is capable of generating nervous impulses on its own without any innervation from the C.N.S. .That pacemaker makes the heart capable of contraction on its own even after cutting all the nerves attached to it.
S.A. -- Sino-Atrial
A.V. -- Atrio-Ventricular

showing:
1. SA node
2. AV node
3. AV Bundle
4. AV branches

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