Cell adhesion molecules of the immunoglobulin superfamily (IgCAMs) are cell surface glycoproteins highly expressed in the developing and mature nervous system. They are characterized by a large extracellular domain containing one or several immunoglobulin-like (Ig) repeats. Cell adhesion molecules of the immunoglobulin superfamily (IgCAMs) play a crucial role in cell-cell interactions during nervous system development and function.