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Advan. Physiol. Edu. 262: 18S-22S, 1992;
1043-4046/92 $5.00
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Advances in Physiology Education, Vol 262, Issue 6 18-S22, Copyright © 1992 by American Physiological Society

ARTICLES

A student apparatus for recording action potentials in cockroach legs

T. M. Linder and J. Palka
Department of Zoology, University of Washington, Seattle 98195.

A comparatively simple apparatus allows even beginning students to observe action potentials in the cockroach leg. The recordings are made extracellularly by impaling the leg on two insect pins. Deflection of large spines on the leg, which are each innervated by one sensory neuron, initiates the action potentials. Using this technique, students observe the all-or-nothing nature of action potentials, their coding of information by frequency, and sensory adaptation.




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