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The Solitary Nucleus of the Hamster

The solitary nuclear complex consists of a number of subdivisions with different cytoarchitectonic features? These subdivisions differ also in the amounts of input they receive from lingual afferent axons. Chorda tympani, lingual (trigeminal), and glossopharyngeal (lingual branch) afferent axons synapse heavily throughout the central subdivision, less heavily in the lateral, ventral, and ventrolateral subdivisions, very lightly in the dorsal and laminar nuclei, and not at all in the medial, magnocellular and dorsolateral subdivisions.* In this study we determined which of these subdivisions contain cells that project rostrally to the pons. To reveal the pontine projection neurons, horseradish peroxidase injections were made that filled or nearly filled the parabrachial nucleus. Comparison of the morphologies of retrogradely labeled cells with Golgiimpregnated neurons permitted identification of cell types forming the pontine projection. The vast majority of retrogradely labeled neurons were, in every case, located in the central subdivision at all rostrocaudal levels (FIG. 1). More cells were labeled in rostral than in caudal parts of this subnucleus. Moderate numbers of labeled cells were also observed in the lateral and ventral subdivisions, primarily at rostral levels, in the ventrolateral subdivision, and in the medial subdivision at all rostrocaudal levels. Few pontine projection neurons were seen in the dorsal and laminar subdivisions, and virtually none in the magnocellular and dorsolateral subdivisions. Thus, subdivisions receiving heavy input from the lingual periphery contain many pontine projection neurons, subdivisions receiving less input contain fewer projection cells, areas with no lingual input contain no projection cells. The medial subdivision is exceptional. It projects to the pons and probably receives general visceral sensory inputs (e.g. Gwyn et al. '). Many of the retrogradely labeled cells of the central and lateral subdivisions had morphologies that were comparable to cell types previously identified in Golgi impregnations (FIG. 2). Most prevalent were elongate cells with ovoid-fusiform somata and dendrites oriented in the mediolateral plane parallel to axons entering from the solitary tract.' Also labeled were stellate cells that send three to four dendrites in all directions, although one or two dendrites often elongate mediolaterally.