has part has part characteristic of inheres in has modifier peripheral nervous system neuron transmission of nerve impulse Abnormality of peripheral nerve conduction Abnormal peripheral nerve transmission An abnormality of the conduction of electrical impulses by peripheral (motor or sensory) nerves. This finding is elicited by a nerve conduction study (NCS). HP:0007186 UMLS:C4020690 HP:0003134 Sensory and motor nerve conduction abnormalities A nerve conduction study (NCS) is commonly conducted together with electromyography in order to evaluate muscle disorders. For the NCS, dermal electrodes are placed at intervals over the nerve to be examined, and a low-intensity current is introduced to generate action potentials. The velocity of the action potential is related to the diameter of the nerve fiber and the presence of a myelin sheath. Diseases of the myelin sheath characteristically reduce the nerve conduction velocity (NCV). The amplitude of the response is also measured. HP:0006832 Abnormality of peripheral nervous system electrophysiology quality abnormal