The heart is derived from the mesoderm, along with skeletal muscles and some other body organs.
The Mesoderm layer
Ectoderm
The mesoderm
ectoderm
nerves
Muscle tissues are derived from the mesodermal layer of the embryonic germ cells through a process called myogenesis.
It develops from the endoderm germ layer
Gastrulation is first step towards germ layer development .
ectoderm.
endoderm
Endoderm: (most internal germ layer) gives rise to the lining of the digestive tract and the organs derived from it, such as the liver and lungs of vertebrates.Mesoderm: (middle germ layer) forms muscle, the skeletal system, and the circulatory system.Ectoderm: (most exterior germ layer) gives rise to the outer covering and, in some phyla, to the central nervous system.
endoderm
If your question is 'Is the trophoblast present during germ layer formation (i.e. gastrulation) ?' then the answer is YES