Organ
Interventricular septum
Contractile partition shared by both ventricles
High-yield
Anterior septal perforators usually arise from the left anterior descending artery; inferior/posterior septal supply comes from the posterior interventricular artery. The familiar two-thirds/one-third map is an approximation.
Overview
Most of the ventricular septum is muscle, with a small fibrous membranous region near its upper end. Besides separating cavities, it contributes to the pumping mechanics of both ventricles and supports important conducting pathways.
Reference facts
- Location
- Between the ventricular cavities, corresponding externally to the interventricular grooves
- Parts
- Large muscular component and small upper membranous component adjacent to the conduction axis
- Blood supply
- Predominantly anterior LAD septal perforators and inferior/posterior branches from the posterior interventricular artery, with variable territories
- Innervation
- Autonomic fibers regulate myocardium; the His–Purkinje conduction system runs within and along the septum
- Relations
- Aortic and tricuspid regions near its membranous end; ventricular cavities on either side
- Function
- Separates ventricular flow and participates in coordinated contraction and ventricular interaction
Clinical correlation
A ventricular septal defect permits flow between ventricles, with effects determined by its size and surrounding circulation. Septal rupture can also occur after myocardial infarction; congenital and acquired defects are different processes.
Frequently asked questions
Where is the interventricular septum located?
Between the ventricular cavities, corresponding externally to the interventricular grooves.
What does the interventricular septum do?
Separates ventricular flow and participates in coordinated contraction and ventricular interaction.
What are the parts of the interventricular septum?
The parts of the interventricular septum are the large muscular component and small upper membranous component adjacent to the conduction axis.
What is the blood supply of the interventricular septum?
Predominantly anterior LAD septal perforators and inferior/posterior branches from the posterior interventricular artery, with variable territories.