Embryonic Heart Fields

Heart lineages contributing to first and second heart fields.

A-E Myocardial progenitor cells stemming from two sources are shown with their respective contribution to the developing mouse heart. The second heart field is shown in green, with the anterior heart field sub-domain and in red shown myocardial cells that are derived from the first heart field. Frontal views at different stages of development (as indicated in the parentheses) are shown in panels A (E7.5) and E (E10.5) and lateral views of the developing mouse heart at E8-8.5, are shown in panels in B-D.