The anatomy, organisation and development of contralateral callosal projections of the mouse somatosensory cortex

Fenlon, Laura R., Suarez, Rodrigo and Richards, Linda J. (2017) The anatomy, organisation and development of contralateral callosal projections of the mouse somatosensory cortex. Brain and Neuroscience Advances, . doi:10.1177/2398212817694888

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Author Fenlon, Laura R.
Suarez, Rodrigo
Richards, Linda J.
Title The anatomy, organisation and development of contralateral callosal projections of the mouse somatosensory cortex
Journal name Brain and Neuroscience Advances   Check publisher's open access policy
ISSN 2398-2128
Publication date 2017-03-08
Sub-type Article (original research)
DOI 10.1177/2398212817694888
Open Access Status DOI
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher Sage
Language eng
Formatted abstract
Background: Alterations in the development of neuronal connectivity can result in dramatic outcomes for brain function. In the cerebral cortex, most sensorimotor and higher-order functions require coordination between precise regions of both hemispheres through the axons that form the corpus callosum. However, little is known about how callosal axons locate and innervate their contralateral targets.

Methods: Here, we use a combination of in utero electroporation, retrograde tracing, sensory deprivation and high resolution axonal quantification to investigate the development, organisation and activity dependence of callosal axons arising from the primary somatosensory cortex of mice.

Results: We show that distinct contralateral projections arise from different neuronal populations and form homotopic and heterotopic circuits. Callosal axons innervate the contralateral hemisphere following a dorsomedial to ventrolateral and region-specific order. Furthermore, we identify two periods of region- and layer-specific developmental exuberance that correspond to initial callosal axon innervation and subsequent arborisation. Early sensory deprivation affects only the latter of these events.

Conclusion: Taken together, these results reveal the main developmental events of contralateral callosal targeting and may aid future understanding of the formation and pathologies of brain connectivity.
Keyword Corpus callosum
Cortical development
Contralateral targeting
Activity dependence
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Mon, 13 Mar 2017, 15:03:19 EST by Anthony Yeates on behalf of Learning and Research Services (UQ Library)