CENTRAL AND PERIPHERAL NEUROSECRETORY CONTRIBUTIONS TO AN INSECT FLIGHT MOTOR NERVE

ight and electron microscopy studies of the nerve to the dorsal longitudinal flight muscle of Manduca sexta established the number of axons within nerve IIN1b and its branches. The neural lamella surrounding the main motor nerve contained small axons with neurosecretory inclusions. In the distal regions of the nerve near the muscle, the inclusions, or vesicles, were of two types: subspherical and irregular. Axons containing the larger "spherical" vesicles were found only in the proximal regions of the nerve.;The transverse nerve contained processes with vesicles similar to those of neuron ;Light and electron microscopy CoCl(,2) backfills of nerve IIN1b produced intensification of neuron ;Cobalt backfills of nerve IIN1b and the transverse nerve revealed that on both sides of the thorax there were at least two peripheral neurosecretory cells which were associated with the link and/or transverse nerves. One of these cells, neuron...