Or toes – see also SYNDACTYLY. A deformity sometimes present at birth, and which tends to run in families. The web may be quite a thin structure, or the ?ngers may be closely united by solid tissue. In any case, separation is a matter of considerable di?culty, because, if the web is simply divided, it heals up as before. A special operation is necessary, consisting in turning back a ?ap of the web upon each of the united ?ngers, or some other device to produce healing in the new position.