overlaps embryonic/larval heart visceral muscle cell larval contractile cardiomyocyte Contractile cardiomyocyte of the larval dorsal vessel. There are 76 of these cells per dorsal vessel. Their myofilaments are not arranged as regularly as in their adult counterparts, and may in some cells deviate from a strictly circular configuration (Lehmacher et al., 2012). larval heart circular muscle cell circular muscle of larval heart fly_anatomy.ontology FBbt:00001048 larva larval cardial cell contractile cardiomyocyte