Conotruncal myocardium arises from a secondary heart field.

By K. Waldo, D. Kumiski, K. Wallis, H. Stadt, M. Hutson, D. Platt, M. Kirby. Development, 2001

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Isl1 identifies a cardiac progenitor population that proliferates prior to differentiation and contributes a majority of cells to the heart. (2003, methodology): “In experiments performed by other investigators, mitotracker was injected into the splanchnic mesoderm behind the outflow tract at stage 14 (Waldo et al., 2001).”
Multipotent embryonic isl1+ progenitor cells lead to cardiac, smooth muscle, and endothelial cell diversification. (2006, unknown): “The more dorsal/ medial localized second lineage takes a distinct migratory path, which results in later arriving cells entering the forming heart region from dorsal positions at the anterior and posterior poles (Mjaatvedt et al., 2001; Waldo et al., 2001; Brand, 2003).”
Building the mammalian heart from two sources of myocardial cells (2005, background): “More recently, a distinct region of PHARYNGEAL MESODERM was identified by two groups as the source of outflow-tract myocardium in the chick embry”