Experimental Brain Research

, Volume 104, Issue 3, pp 534–540

The auditory pathway in cat corpus callosum

  • Stephanie Clarke
  • François de Ribaupierre
  • Victoria M. Bajo
  • Eric M. Rouiller
  • Rudolf Kraftsik
Research Note

DOI: 10.1007/BF00231988

Cite this article as:
Clarke, S., de Ribaupierre, F., Bajo, V.M. et al. Exp Brain Res (1995) 104: 534. doi:10.1007/BF00231988

Abstract

The cortical auditory fields of the two hemispheres are interconnected via the corpus callosum. We have investigated the topographical arrangement of auditory callosal axons in the cat. Following circumscribed biocytin injections in the primary (AI), secondary (AII), anterior (AAF) and posterior (PAF) auditory fields, labelled axons have been found in the posterior two-thirds of the corpus callosum. Callosal axons labelled by small individual cortical injections did not form a tight bundle at the callosal midsagittal plane but spread over as much as one-third of the corpus callosum. Axons originating from different auditory fields were roughly topographically ordered, reflecting to some extent the rostro-caudal position of the field of origin. Axons from AAF crossed on average more rostrally than axons from AI; the latter crossed more rostrally than axons from PAF and AIL Callosal axons originating in a discrete part of the cortex travelled first in a relatively tight bundle to the telo-diencephalic junction and then dispersed progressively. In conclusion, the cat corpus callosum does not contain a sector reserved for auditory axons, nor a strictly topographically ordered auditory pathway. This observation is of relevance to neuropsychological and neuropathological observations in man.

Key words

Corpus callosum Auditory pathway Primary auditory field Tonotopy Cat 

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • Stephanie Clarke
    • 1
  • François de Ribaupierre
    • 1
  • Victoria M. Bajo
    • 1
  • Eric M. Rouiller
    • 2
  • Rudolf Kraftsik
    • 3
  1. 1.Institut de PhysiologieUniversité de LausanneLausanneSwitzerland
  2. 2.Institut de PhysiologieUniversité de FribourgFribourgSwitzerland
  3. 3.Institut d'AnatomieUniversité de LausanneLausanneSwitzerland