Evaluation of inputs to rat primary auditory cortex from the suprageniculate nucleus and extrastriate visual cortex.

The Journal of Comparative Neurology
Philip H SmithDaniel J Uhlrich

Abstract

Evidence indicates that visual stimuli influence cells in the primary auditory cortex. To evaluate potential sources of this visual input and how they enter into the circuitry of the auditory cortex, we examined axonal terminations in the primary auditory cortex from nonprimary extrastriate visual cortex (V2M, V2L) and from the multimodal thalamic suprageniculate nucleus (SG). Gross biocytin/biotinylated dextran amine (BDA) injections into the SG or extrastriate cortex labeled inputs terminating primarily in superficial and deep layers. SG projects primarily to layers I, V, and VI while V2M and V2L project primarily to layers I and VI, with V2L also targeting layers II/III. Layer I inputs differ in that SG terminals are concentrated superficially, V2L are deeper, and V2M are equally distributed throughout. Individual axonal reconstructions document that single axons can 1) innervate multiple layers; 2) run considerable distances in layer I; and 3) run preferentially in the dorsoventral direction similar to isofrequency axes. At the electron microscopic level, SG and V2M terminals 1) are the same size regardless of layer; 2) are non-gamma-aminobutyric acid (GABA)ergic; 3) are smaller than ventral medial geniculate terminals syna...Continue Reading

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Citations

Sep 2, 2011·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Jerry L ChenElly Nedivi
Dec 12, 2012·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Scott J CruikshankBarry W Connors
May 18, 2013·Cerebral Cortex·Jian MaYong-Chun Yu
Oct 24, 2014·Frontiers in Systems Neuroscience·Aeyal RazMatthew I Banks
Jun 28, 2016·Current Opinion in Neurobiology·Jennifer K BizleyStephen M Town
Sep 12, 2017·ELife·Sebastian A Vasquez-LopezJohannes C Dahmen
Jul 10, 2019·The European Journal of Neuroscience·Katja SaldeitisEike Budinger

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