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

doi:10.1016/0006-8993(86)91583-0

Brain Research

Volume 367, Issues 1–2, 5 March 1986, Pages 96-113

https://doi.org/10.1016/0006-8993(86)91583-0 Get rights and content

Abstract

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

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

Abstract

Neuroscience

Brain Research

Brain Research

Brain Research

Neurosci. Lett.

Exp. Neurol.

Exp. Neurol.

Ascending projections to the inferior colliculus

J. Comp. Neurol.

Inferior colliculus. I. Comparison of response properties of neurons in central, precentral and external nuclei of adult cat

J. Neurophysiol.

Auditory responses of neurons in the lateral mesencephalic nucleus (inferior colliculus) of the barbary dove

J. Physiol.

Ascending projections form the primary cochlear nuclei and nucleus laminaris in the pigeon

J. Comp. Neurol.

The distribution of primary lagenar fibers within the vestibular nuclear complex of the pigeon

Brain Behav. Evol.

Central auditory pathways of nonmammalian vertebrates

Morphology and physiology of the auditory system

A comparison of the size of an auditory nucleus (n. mesencephalicus lateralis, pars dorsalis) with the size of the optic lobe in twenty-seven species of birds

J. Comp. Neurol.

The response properties of auditory neurones in the midbrain of the domestic fowl (Gallus gallus) to monaural and binaural stimuli

J. Comp. Physiol.

Ascending projections from the cochlear nuclei and nucleus laminaris to nucleus mesencephalicus lateralis pars dorsalis in the chicken

Anat. Rec.

The afferent connections of the main and the accessory olfactory bulb formations in the rat: an experimental HRP study

J. Comp. Neurol.

The course of the stria of Monakow and Held in the cat

J. Comp. Neurol.

The organization of central auditory pathways in a reptile,Iguana iguana

J. Comp. Neurol.