Abstract
The distribution pattern of the primary afferents to the cochlear nuclei was proposed by Cajal (1909) and Lorente de Nó (1933). Later it was analyzed by different authors in several different species (for a review, see Ahesen et al., 1978). These authors concluded that the primary fibers branch in a “V” shape and that they have a geometric distribution that in all cases is related to a frequency; that is, to a particular origin in the cochlea. Our group has analyzed the problem with transganglionic HRP transport and silver staining methods (Merchan, 1985 a, b) and has concluded that apart from the tonotopic “V” shapes reported by Lorente de N6 (1933) there are nerve fibers that give rise to two primary plexuses (anterior and posterior, Fig. 1) that have a different distribution.
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References
Arnesen, A. R., Osen, K. K. and Mugnaini, E., 1978, Temporal and spatial sequence of anterograde degeneration in the cochlear nerve fibers of the cat, J. Comp. Neurol., 178:679–696.
Lorente de Nó, 1933, Anatomy of the eighth nerve. The central projection of the nerve endings of the internal ear, Laryngoscope, 43:1–38.
Merchan, M. et al., 1985a, Distribution of the primary afferent fibers in the cochlear nuclei. A silver and horseradish peroxidase (HRP) study, J. Anat., 141:121–130.
Merchan, M. et al., 1985b, Distribution of primary cochlear afferents in the bulbar nuclei of the rat: a horseradish peroxidase (HRP) study in parasagittal sections, J. Anat., 144:71–80.
Ramon y Cajal, 1909, Histologie du Systeme Nerveux de L’Homme et des Vertebres, Paris: Maloine.
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© 1988 Plenum Press, New York
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Merchan, M., Lopez, D.E., Saldaña, E., Collia, F. (1988). Relationship between the Level of Origin of Primary Fibers in the Rat Cochlea and their Spatial Distribution in the Rat Cochlear Nuclei. In: Syka, J., Masterton, R.B. (eds) Auditory Pathway. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1300-7_15
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DOI: https://doi.org/10.1007/978-1-4684-1300-7_15
Publisher Name: Springer, Boston, MA
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