"The extrinsic supply is from parasympathetic (from the vagus nerve) and sympathetic nerves to form both the superficial and deep cardiac plexuses, which provide post-ganglionic fibres to the sinoatrial (SA) and atrioventricular (AV) nodes, as well as other parts of the cardiac conduction system."
"pre-ganglionic fibres from T1-5 spinal cord segments synapse in cervical and thoracic sympathetic ganglia"
"post-ganglionic fibres from these ganglia (cervical cardiac nerves and thoracic cardiac branches) then supply the cardiac plexus"
"pre-ganglionic fibres from the dorsal motor nucleus travel with the vagus nerve (CN X) and directly supply the cardiac plexus"
"The cardiac conduction system represents the intrinsic component and is composed of (in order of depolarisation):"
"arterial supply from SA nodal branches of RCA (60% of the time) or LCx (40% of the time) 5"
"arterial supply from AV nodal branch of RCA generally 5"
"much of the right bundle runs through the moderator band (septomarginal trabecula) to reach anterior papillary muscle of the RV 5"
"Purkinje fibres"
Expected headings
"Extrinsic (autonomic) innervation"
"Intrinsic innervation"
"The heart has extrinsic and intrinsic innervation, which allows the heart to continue beating if its nerve supply is disrupted (e.g. in cardiac transplant)."