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This portion of Figure 10-6A from Developmental Stages in Human Embryos shows an outline of the myocardial mantle and endocardial tube at the plexiform phase of cardiac development.

Label Key:
* - Left Interventricular Sulcus
Ao.1 - Aortic Arch 1
C-T - Conotruncus
RV - Right Ventricle
LV - Left Ventricle
RA - Right Atrium
LA - Left Atrium

Fig. 10-6A. O'Rahilly and Müller, 1987.

Keywords: aortic arch 1, conotruncus, endocardial tube, interventricular sulcus, left atrium, left ventricle, myocardial mantle, plexiform phase of cardiac development, right atrium, right ventricle

Source: The Virtual Human Embryo.