[Intraneural topography of the median nerve at the elbow level--an analysis using intraneural neurography].

We examined intraneural topography of the median nerve at the elbow level by means of intraneural neurography in 38 individuals. A tungsten microelectrode was inserted into the median nerve trunk at the elbow where largest amplitude of the nerve action potential could be obtained with stimulations over median nerve trunk at the wrist. Each of six areas innervated by the nerve was stimulated supramaximally.

[Age-related changes in nerve action potentials of median nerve--an analysis using intraneural neurography].

Age-related decrease in peripheral nerve conduction velocity and the amplitude of sensory nerve action potentials is well established in humans. However, evaluation of the sensory nerve action potentials is subject to technical constraints because of its small size and variability of the values. To elucidate age-related differences, we determined the amplitude of median nerve action potentials in 52 healthy individuals aged 16 to 88 years by means of intraneural neurography.