1
Septal side of right atrium. Impulse relay.
2
Extends into interventricular septum. Transmits impulse.
3
Back wall of right atrium, only requires external stimulation for speed
4
Extends toward apex up along external ventricles. Carries impulses.
5
End of Θ. Causes ventricles to contract with impulse delivery to myocardial fibers.
