(click image to view original size)

Modality: Anatomic specimen

Orientation: Four chamber view

Description: This simulated four chamber echocardiographic view is taken from the same heart as shown in image A010100-137a, but is sectioned more posteriorly and inferiorly. The cut demonstrates the overlapping areas of atrial and muscular myocardium, which produce the so-called atrioventricular muscular sandwich. The atrial muscular buttress is just beginning to overlap the crest of the muscular ventricular septum. The fibrous tissue at the apex of the triangle of Koch is along the postero-inferior component of the aortic root (black asterisk). In this section, the atrioventricular component of the mebranpuis septum forms part of the normal offseting of the hinges of the atrioventricular valves. The tricuspid valve (red arrow) is in a more apical position with respect to the muscular interventricular septum. The yellow arrow marks the superior insertion of the mitral valve.

Contributor: Diane E. Spicer, BS
Institution: The Congenital Heart Institute of Florida (CHIF)

Image Label:  A010100-138a

Source of Image: Idriss Archive, Lurie Children’s Hospital, Chicago, IL

Image Certification: pending

AWG Rating: pending