True about SA node are all except ?

SA node is located in the upper pa of crista terminalis at the junction of SVC and the right atrium. It is the pacemaker of the hea and generates impulse at a rate of 70-100/min. SA node is suplied by nodal aery, a branch of RCA in 65% cases and a branch of circumflex branch of LCA in 35% cases. SA node is supplied by right vagus/parasympathetic (inhibitory) and right Sympathetic (excitatory) system as it develops from structures on the right side of embryo. The SA node consists of connective tissue stroma containing an irregular whorled network of cardiac nodal cells, the SA nodal aery and numerous nerve endings (postganglionic parasympathetic and postganglionic sympathetic).