Final answer:
The splanchnic mesoderm gives rise to various structures including cardiac tissues, muscles of the intestines, and the connective tissues of organs like the kidneys and spleen.
Step-by-step explanation:
The splanchnic mesoderm gives rise to the cardiac tissues, muscles of the intestines, and the connective tissues of the visceral organs like the kidneys and spleen.
The mesoderm is one of the three germ layers formed during embryogenesis. It is located between the ectoderm and endoderm. While the ectoderm gives rise to the nervous system and the epidermis, and the endoderm generates the digestive and respiratory tract linings, the mesoderm is responsible for forming all specialized muscle tissues, including those in the heart and gastrointestinal tract, connective tissues such as bone and blood cells, as well as various organs including the kidneys and spleen.
Additionally, mesoderm gives rise to the somites and the notochord which are crucial in the development of the vertebrate axial skeleton.