Spleen and thymus David Kachlík Martin Špaček. Lymphoid organs Primary (central) lymphoid organs –Thymus –Bone marrow = Medulla ossium Secondary (peripheral)
3th Week-Gastrulation Primitive Node and Streak (16 DAY) Ectoderm Mesoderm Endoderm Prochordal plate,Notochord,Primitive Node Neuroctoderm.
Spleen and thymus
