Question

During the embryonic stage, lymphocytes arise from mesenchymal cells located in which set of organs?

Options

• Lymph nodes, spleen and intestines

• Lymphatic nodules, gut and tissues

• Yolk sac, liver and spleen

• Bone marrow, thymus and tonsils

Answer 1

In embryos, lymphocytes arise from mesenchymal cells of the yolk sac, liver and spleen. These are the sites of origin during the embryonic stage.