The development and classification of anomalies of the limbs in the human.

It is stressed that more detailed and more precise information concerning the human limb is available than is found in even the most recent books on the development of the vertebrate limb. The classifications of limb anomalies are multiplying but are not necessarily becoming better. In addition to continued vigilance concerning possible teratogens, the most valuable approach in the human is the superimposition of genetic data (where they exist) onto a detailed classification based on sound morphology and current principles of anatomical terminology.