Limb Buds

Limb buds are the precursors of arms and legs during embryonic development. They form shortly after gastrulation, when the three germ layers – the ectoderm, mesoderm, and endoderm – have divided the embryo into different regions. Limb buds are made up of mesoderm tissue, which induces the ectoderm to form within the bud to create the limb structures. The limb buds will eventually go through a process of chondrification and ossification to become the bones of the arm and leg. The importance of limb buds in embryology is significant as defects in their formation can cause devastating congenital limb deformities. Research on limb buds has also contributed to regenerative medicine and artificial limb prosthesis construction.