CARDIAC ELECTRICAL ACTIVITY-NODES
From NeuroRehab.wiki
SUMMARY
1. Conducts impulses from SA node ⟹ AV node ⟹ bundle of His ⟹ right & left branches ⟹ subendocardial Purkinje fibers.
2. SA node: situated in the right atrium, just below the SVC, atop the crista terminalis. Contains P (pacemaker) cells.
3. AV node: situated in the IA septum, above & to the left of opening of coronary sinus.
4. Because the fibrous framework of the heart separates the atria from ventricles, the bundle is the only means of conducting normal impulses from the atria to ventricles.
Image: J. Heuser, CC BY 2.5 [Accessed 7 Apr. 2019].
Reference(s)
Barrett, K.E., Barman, S.M., Brooks, H.L., X, J. and Ganong, W.F. (2019). Ganong’s review of medical physiology. 26th ed. New York: Mcgraw-Hill Education
