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Bundle of His and Purkinje Fibres

  • Tract of specialized tissue extending into the interventricular septum
  • The Bundle divides into the right and left branches
  • The left bundle splits into two further fasciculi
  • Impulses travel faster down the left bundle than the right allowing the larger thicker walled left ventricle to contract simultaneously with the smaller thinner walled right ventricle
  • Purkinje fibres extend from the bundles into the endocardium
  • Can serve as a pacemaker discharging impulses at a rate of 20-40 beats/min