Abstract
The synaptic organization of the motor nucleus of the trigeminal nerve in the cat was examined electron microscopically after labelling the motoneurons or the axon terminals on the motoneurons by retrograde or anterograde axonal transport of horseradish peroxidase (HRP).The experiments were carried out on young adult cats (1. 5 to 3. 0 kg) anesthetized with intraperitoneal Nembutal (35 mg/kg). For labelling the motoneurons, 2% solution of HRP (Toyobo Grade-I-C, RZ: 3. 4) dissolved in sterile 0. 9% saline was injected within the muscle belly of the temporal, masseter or anterior digastric muscle with a fine caliber intradermic needle attached to a syringe. For labelling axon terminals of the commissural fibers arising contralaterally from the commissural interneurons around the trigeminal motor nucleus, a single injection of 0. 05 μ l of 50% HRP dissolved in 2% dimethylsulfoxide or in sterile 0. 9% saline was performed stereotaxically within the trigeminal motor nucleus and its adjacent regions.
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