Document Detail

The organization of frontoparietal cortex in the tree shrew (Tupaia belangeri): II. Connectional evidence for a frontal-posterior parietal network.
MedLine Citation:
PMID:  17206607     Owner:  NLM     Status:  MEDLINE    
Tree shrews are small squirrel-like mammals that are the closest living relative to primates available for detailed neurobiological study. In a recent study (Remple et al. [2006] J. Comp. Neurol. 497:133-154), we provided anatomical and electrophysiological evidence that the frontoparietal cortex of tree shrews has two motor fields (M1 and M2) and five somatosensory fields (3a, 3b, S2, somatosensory caudal area [SC], and parietal ventral area [PV]). In the present study, we injected anatomical tracers into M1, M2, 3a, 3b, SC, and posterior parietal cortex to establish the ipsilateral cortical connections of these areas. The results provide evidence for a number of new cortical areas including medial motor and somatosensory areas (MMA and MSA), three posterior parietal areas (PPd, PPv, and PPc), and an area ventral to temporal inferior cortex (TIV). Ml receives topographic projections from M2, MMA, 3a, and PPv, and nontopographic connections from the temporal anterior and dorsal areas (TA and TD), PPc, TIV, and MSA. The connections of M2 are similar to those of M1, except that M2 receives denser projections from TIV, PPc, and dorsal frontal cortex and sparser input from M1. Areas 3a, 3b, and SC receive dense topographic projections from each other, S2, and PV and sparser connections from PPd and PPv. Area 3a receives additional input from posterior parietal and temporal regions and from M1 and MMA. Overall, the frontoparietal connections of tree shrew cortex are most similar to those of prosimian primates and quite different from those of more distant relatives such as rats.
Michael S Remple; Jamie L Reed; Iwona Stepniewska; David C Lyon; Jon H Kaas
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  501     ISSN:  0021-9967     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-04-19     Completed Date:  2007-05-08     Revised Date:  2014-01-17    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  121-49     Citation Subset:  IM    
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MeSH Terms
Brain Mapping
Frontal Lobe / physiology*
Indicators and Reagents / administration & dosage
Motor Cortex / physiology
Nerve Net / physiology*
Neural Pathways / physiology
Parietal Lobe / physiology*
Somatosensory Cortex / physiology
Synaptic Transmission
Tupaiidae / physiology*
Grant Support
Reg. No./Substance:
0/Indicators and Reagents

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