Abstract
The somata of the claw opener excitor (OE), the slow closer excitor (SCE), and the fast closer excitor (FCE) motoneurons were physiologically identified in the lobster, Homarus americanus, using an isolated claw ganglion preparation. Depolarization of the soma produced paired impulses with an interpulse interval of 10–12 ms, which demonstrates that doublet production is an intrinsic motoneuron property. Similar paired impulses were found for the FCE axon in intact lobsters where they occurred with a shorter interpulse interval for the cutter than for the crusher claw.
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