Biomedical Engineering Reference
In-Depth Information
Fig. 8.5
Impulse propagation through landmarks of the heart system
Bundle of His splits into two branches in the inter-ventricular septum, namely the
left bundle branch and the right bundle branch. The electrical impulses then enter
the base of the ventricle at the Bundle of His (node D) and follow the left and right
bundle branches along the inter-ventricular septum (see Fig.
8.5
(c)).
The two separate bundle branches propagating along each side of the septum
constitute the left and right bundle branches.We have identified two landmark nodes
EandF(seeFig.
8.4
(b)) in the lower part of the heart for the left and right bundle
branches. These specialised fibres conduct the impulses at a very rapid velocity (see
Tables
8.1
and
8.2
). The left bundle branch activates the left ventricle, whereas the
right bundle branch activates the right ventricle (see Fig.
8.5
(d)).
The bundle branches then divide into an extensive system of Purkinje fibres that
conduct the impulses at high velocity (see Tables
8.1
and
8.2
) throughout the ventri-
cles. The Purkinje fibres stimulate individual groups of myocardial cells to contract.
We have identified two final landmark nodes G and H (see Fig.
8.4
(b)) at the end of
the Purkinje fibres in both sides of the ventricles. These two nodes represent the end
Search WWH ::
Custom Search