Origin of ascending auditory projections to the nucleus mesencephalicus lateralis pars dorsalis in the chicken

摘要: Abstract Ascending auditory projections to the nucleus mesencephalicus lateralis pars dorsalis (MLd) were studied in white Leghorn chickens by means of unilateral injections horseradish peroxidase into MLd and tritiated leucine angularis or combined magnocellularis laminaris. The experiments showed that sends an extensive projection contralateral a smaller rostral pole ipsilateral MLd; lagenar region contributes these bilateral connections. Nucleus also projects bilaterally superior olive ventralis lemnisci dorsal lateral lemniscus. Projections from laminaris demonstrated olive, lemniscal nuclei small medial bilaterally; is much denser than one. Other having ascending connections with include ventralis, MLd. project but more sparsely their projection. Although several findings correspond previously shown pigeon brainstem, they differ fundamentally we find both projecting different areas on sides brain. In particular, our observation cochlear has demonstrates important avian similarity brainstem pathways other terrestrial vertebrates.