[Innervation anomalies]

The deviation from anatomically described innervation can often occur. It is mainly described on muscles of the limbs. Constant attention should give to this fact during the process of diagnosis of peripheral nerve lesions. Electrophysiological methods (EMG, ENG with blockade of nerve, collision technique and simultaneous lead) can help to detect this anomalies. Double innervation, abnormal innervation and communications among nerves are causes of anomalies of innervation. The fact of communications of fibers among nerves is better called "nerve communication" than "nerve anastomosis". It is vague whether this anomalies of innervation are embryological malformations or reactions of adaptation after different diseases.