Innervation of the heart
Updates to Article Attributes
The heart has extrinsic and intrinsic innervation, which allows the heart to continue beating if the nerve supply to the heart is disrupted (e.g. in cardiac transplant).
The heart receives innervation from both the superficial and deep cardiac plexuses, which have both parasympathetic (from vagus nerve) and sympathetic inputs, which provide post-ganglionic fibres to the SAsinoatrial (SA) and AV nodesatrioventricular (AV) nodes, as well other parts of the cardiac conduction system.
The cardiac conduction system is composed of:
- sinoatrial (SA) node
- internodal connections
- atrioventricular (AV) node
- bundle of His
- right and left bundle branches
- Purkinje fibres
Cardiac myocyte conduction spreads through the heart from myocyte-to-myocyte starting the SA (pacing) node then via the other parts of the cardiac conduction in turn as outline above.
Each part of the cardiac conduction system has its own instrinsicintrinsic pacemaker, which means that if a higher pacing centre (e.g. SA node) is damaged and stops functioning a lower pacing centre (e.g AV node) can take over.
-<p>The <strong>heart</strong> has extrinsic and intrinsic <strong>innervation</strong>, which allows the <a title="Heart" href="/articles/heart">heart</a> to continue beating if the nerve supply to the heart is disrupted (e.g. in cardiac transplant).</p><p>The heart receives innervation from both the superficial and deep cardiac plexuses, which have both parasympathetic (from <a href="/articles/vagus-nerve">vagus nerve</a>) and sympathetic inputs, which provide post-ganglionic fibres to the SA and AV nodes as well other parts of the cardiac conduction system. </p><p>The <strong>cardiac conduction system</strong> is composed of:</p><ul>- +<p>The <strong>heart</strong> has extrinsic and intrinsic <strong>innervation</strong>, which allows the <a href="/articles/heart">heart</a> to continue beating if the nerve supply to the heart is disrupted (e.g. in <a title="cardiac transplant" href="/articles/cardiac-transplant">cardiac transplant</a>).</p><p>The <a title="Heart anatomy" href="/articles/heart">heart</a> receives innervation from both the superficial and deep <a title="Cardiac plexus" href="/articles/cardiac-plexus">cardiac plexuses</a>, which have both parasympathetic (from <a href="/articles/vagus-nerve">vagus nerve</a>) and sympathetic inputs, which provide post-ganglionic fibres to the sinoatrial (SA) and atrioventricular (AV) nodes, as well other parts of the cardiac conduction system. </p><p>The <strong>cardiac conduction system</strong> is composed of:</p><ul>
-</ul><p>Cardiac myocyte conduction spreads through the heart from myocyte-to-myocyte starting the SA (pacing) node then via the other parts of the cardiac conduction in turn. </p><p>Each part of the cardiac conduction system has its own instrinsic pacemaker, which means that if a higher pacing centre (e.g. SA node) is damaged and stops functioning a lower pacing centre (e.g AV node) can take over. </p>- +</ul><p>Cardiac myocyte conduction spreads through the heart from myocyte-to-myocyte starting the SA (pacing) node then via the other parts of the cardiac conduction in turn as outline above. </p><p>Each part of the cardiac conduction system has its own intrinsic pacemaker, which means that if a higher pacing centre (e.g. SA node) is damaged and stops functioning a lower pacing centre (e.g AV node) can take over. </p>
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