QS Study

An inter-ventricular septum is a stout wall separating the lower chambers (the ventricles) of the heart from one another. It is the wall of the heart which is located intermediately towards the right and left ventricles. It contributes to the pumping function of the left ventricle.

Development of inter-ventricular septum:

It develops from the following sources:

a) interventricular septum.

b) Bulbar septum.

c) Septum intennedium.

Muscular part: Develops from the inter-ventricular septum. The muscular part is thick and creates a major part of the septum.

Membranous part: Develops from bulbar septum and septum intermedium or proliferation of AV cushion.

Because of its position over the septal cusp of the tricuspid valve, a third part of the septum is considered as an atrioventricular part. The membranous part of the septum is the most frequent location for ventricular septal defects which are generally congenital.

Fig: Development of Inter-ventricular Septum

Developmental anomalies –

Ventricular septal defects (VSD): is the most common type of cardiac defect. There are following types of VSDs-

a) Membranous VSD.

b) Muscular VSD.

c) Congenital absence of interventricular septum.

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