THE CONTEXT
Congenital ventricular septal defects arise during ventricular septation; their location is described in relation to the membranous and muscular septum.
Development and anatomical divisions
| Feature | Details |
|---|
Developmental basis | Congenital ventricular septal defect results from incomplete septation of the ventricles. |
|---|
Septal structure | The interventricular septum has a membranous portion and a muscular portion. |
|---|
Muscular subdivisions | The muscular portion comprises inflow, trabecular and outflow portions. |
|---|
Most common defect location
•
Perimembranous defects: Most congenital defects occur at the junction of the membranous and muscular portions of the septum.