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Intrinsic Connections of the Core Auditory Cortical Regions and Rostral Supratemporal Plane in the Macaque Monkey

Lookup NU author(s): Dr Yuki Kikuchi

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Abstract

In the ventral stream of the primate auditory cortex, cortico-cortical projections emanate from the primary auditory cortex (AI) along 2 principal axes: one mediolateral, the other caudorostral. Connections in the mediolateral direction from core, to belt, to parabelt, have been well described, but less is known about the flow of information along the supratemporal plane (STP) in the caudorostral dimension. Neuroanatomical tracers were injected throughout the caudorostral extent of the auditory core and rostral STP by direct visualization of the cortical surface. Auditory cortical areas were distinguished by SMI-32 immunostaining for neurofilament, in addition to established cytoarchitectonic criteria. The results describe a pathway comprising step-wise projections from AI through the rostral and rostrotemporal fields of the core (R and RT), continuing to the recently identified rostrotemporal polar field (RTp) and the dorsal temporal pole. Each area was strongly and reciprocally connected with the areas immediately caudal and rostral to it, though deviations from strictly serial connectivity were observed. In RTp, inputs converged from core, belt, parabelt, and the auditory thalamus, as well as higher order cortical regions. The results support a rostrally directed flow of auditory information with complex and recurrent connections, similar to the ventral stream of macaque visual cortex.


Publication metadata

Author(s): Scott BH, Leccese PA, Saleem KS, Kikuchi Y, Mullarkey MP, Fukushima M, Mishkin M, Saunders RC

Publication type: Article

Publication status: Published

Journal: Cerebral Cortex

Year: 2017

Volume: 27

Issue: 1

Pages: 809-840

Print publication date: 01/01/2017

Online publication date: 29/11/2015

Acceptance date: 29/11/2015

ISSN (print): 1047-3211

ISSN (electronic): 1460-2199

Publisher: Oxford University Press

URL: http://dx.doi.org/10.1093/cercor/bhv277

DOI: 10.1093/cercor/bhv277

PubMed id: 26620266


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