You forgot to mention the epicardium. the thin surface on the surface of the heart. the pericardium is not actualyy part of the heart but a bag that holds the heart.
- Performance of the myocardium is mediated by the [autonomic nervous system]. The sinoatrial node propagates electrical/sympathetic [systole]. The spinal ganglia and vagus nerve propagate electrical/parasympathetic [diastole]. --Lbeben (talk) 02:21, 18 December 2007 (UTC)--Lbeben (talk) 02:34, 17 December 2007 (UTC)