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Anatomic locations of ventricular septal defects

Anatomic locations of ventricular septal defects
Left panel: The ventricular septum, viewed from the right ventricular side (left panel), is made up of four components: the inlet (I) extends from the tricuspid annulus to attachments of the tricuspid valve; the trabecular septum (T) extends from inlet out to apex and up to smooth-walled outlet; the outlet (O) or infundibular septum extends up to the pulmonary valve; and the membranous septum.
Right panel: The anatomic location of ventricular septal defects.
a: outlet defect; b: papillary muscle of the conus; c: perimembranous defect; d: marginal muscular defects; e: central muscular defects; f: inlet defect; g: apical muscular defects.
Courtesy of Thomas Graham, MD.
Graphic 55308 Version 2.0