Organization of rodent auditory cortex: Anterograde transport of PHA-L from MGv to temporal neocortex

L. M. Romanski, Joseph Ledoux

Research output: Contribution to journalArticle

Abstract

In the present study we analyzed the organization of the thalamocortical projections of the specific auditory relay nucleus of the thalamus, the ventral division of the medial geniculate body (MGv), using the anterograde axonal tracer Phaseolus vulgaris leucoagglutinin. All injections of MGv produced dense labeling of axonal fibers in temporal cortex. In all cases, labeled axons were predominantly concentrated in cortical layers III and IV and, to a lesser extent, at the junction of layers V and VI. Injections confined to the medial regions of MGv, and specifically to the ovoid nucleus of MGv (OV, pars ovoidea), resulted in anterograde labeling of TE1, with minor labeling of the ventral quarter of TE1, designated subarea TE1v. Injections placed in lateral regions of MGv and occupying the lateral ventral subnucleus (LV), or injections in the mediolateral center of MGv and occupying parts of LV and OV, also resulted in labeling of area TE1 and minor labeling of TE1v. However, these injections also produced labeling in areas TE2 and TE3. Thus, area TE1 (excluding subarea TE1v) receives heavy projections from all aspects of MGv and appears to be the core target of MGv. While regions of MGv also project to surrounding cortical belt areas, these projections tend to be lighter and to vary depending on the region of MGv examined. These results, together with other connectional findings, and cytoarchitectonic and physiological studies, suggest that TE1 (possibly excluding subarea TE1v) is the primary auditory cortex in the rat.

Original languageEnglish (US)
Pages (from-to)499-514
Number of pages16
JournalCerebral Cortex
Volume3
Issue number6
StatePublished - 1993

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Auditory Cortex
Neocortex
Rodentia
Injections
Geniculate Bodies
Ventral Thalamic Nuclei
Temporal Lobe
Axons
plants leukoagglutinins

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Organization of rodent auditory cortex : Anterograde transport of PHA-L from MGv to temporal neocortex. / Romanski, L. M.; Ledoux, Joseph.

In: Cerebral Cortex, Vol. 3, No. 6, 1993, p. 499-514.

Research output: Contribution to journalArticle

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