Journal
BRAIN RESEARCH
Volume 1042, Issue 1, Pages 62-72Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.brainres.2005.02.015
Keywords
auditory cortex; axon collaterals; descending pathways; efferent system
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Funding
- NIDCD NIH HHS [DC05277, DC04391, R01 DC004391, R03 DC010245, R01 DC004391-06A1] Funding Source: Medline
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Auditory cortex projects directly and bilaterally to the inferior colliculus (IC), We used multiple fluorescent retrograde tracers to determine whether individual cortical cells project to both the left and right IC. Injection of different tracers into each IC labeled many cells in a sheet that extended throughout much of temporal cortex in both hemispheres, Most cells contained a single tracer. with the majority of these labeled from the ipsilateral IC. Numerous double-labeled cells were observed throughout the same areas of temporal cortex, The double-labeled cells form a small percentage of the cortical cells that project to the ipsilateral IC (6.1% on average) and a much larger percentage of the cells that project to the contralateral IC (46.4% on average). Unilaterally projecting cells are well positioned to have effects limited to one IC, whereas bilaterally projecting cells are likely to have a broader influence and may coordinate activity on the two sides of the midbrain. (c) 2005 Elsevier B.V. All rights reserved.
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