Structure and Synaptic Activation of the Fast Coxal Depressor Motoneurone of the Cockroach, Periplaneta Americana

Abstract

1. Using Procion Yellow dye injection the structure of the fast coxal depressor motoneurone was determined. 2. The cell body of the slow depressor motoneurone was located within the metathoracic ganglion. 3. Intracellular records from the fast motoneurone failed to reveal any post-synaptic response when the largest abdominal giant fibres were stimulated. 4. Smaller abdominal afferent fibres gave an excitatory input.