Extracellular Recording From a Nerve Bundle

Figure 6 illustrates stimulation and recording of a nerve bundle rather than a single axon. Recall that a nerve bundle, or nerve, is made up of a group of individual axons. Stimulating electrodes are placed near one end of the nerve bundle to depolarize the axons to threshold and initiate action potentials, and recording electrodes are placed at the other end to record the resulting extracellular potential changes produced by the action potentials propagating along the nerve. Trace 1 of Fig. 6 shows that when a very weak stimulus is delivered no action potential is recorded. The small transient diphasic deflection is due to interference picked up by the recording electrodes from the stimulating electrodes; this small initial deflection is known as a stimulus artifact.

Increasing the stimulus intensity further produces a larger artifact, but still no action potential is produced

Stimulating Recording Electrodes Electrodes

Nerve

Axons

.Stimulus Artifact jLAC

Action Potential

Action Potential t

Stimulate Nerve

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