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Midline and intralaminar thalamic connections with the orbital and medial prefrontal networks in macaque monkeys

David T Hsu1, Joseph L Price

  • 1Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

The Journal of Comparative Neurology
|July 13, 2007
PubMed

Insights

Midline and intralaminar thalamic nuclei (MITN) connect strongly to the medial prefrontal cortex in monkeys, particularly the subgenual region involved in emotion and mood regulation.

Area of Science:

  • Neuroscience
  • Primate Brain Connectivity
  • Thalamocortical Projections

Background:

  • Midline and intralaminar thalamic nuclei (MITN) were historically considered to have nonspecific projections.
  • Recent rat studies indicate restricted connections to the prefrontal cortex, but primate studies are limited.
  • The association of MITN with specific prefrontal networks (orbital vs. medial) remains unclear.

Purpose of the Study:

  • To investigate the connections of MITN within the prefrontal cortex of cynomolgus monkeys.
  • To determine how MITN relate to the orbital and medial prefrontal networks.
  • To elucidate the anatomical pathways potentially involved in emotional and visceral control.

Main Methods:

  • Utilized retrograde and anterograde tracer injections into the orbital and medial prefrontal cortex (OMPFC) of cynomolgus monkeys.
  • Examined tracer distribution to map MITN connections with specific prefrontal cortical areas.
  • Focused on dorsal midline thalamic nuclei, including paraventricular (Pa) and parataenial (Pt) nuclei.

Main Results:

  • MITN exhibit strong connections with the medial prefrontal network, especially dorsal midline nuclei (Pa, Pt) projecting to subgenual areas (25, 32, 14c).
  • Orbital network areas showed weak connections with MITN, with some exceptions like area 13a connecting to Pt.
  • Anterograde and retrograde tracing confirmed heavy labeling in medial prefrontal areas, particularly ventral to the corpus callosum genu.

Conclusions:

  • MITN, especially dorsal midline nuclei, are strongly connected to the medial prefrontal network, challenging previous notions of nonspecific projections.
  • These findings highlight a significant anatomical pathway between the paraventricular nucleus and the subgenual cortex, relevant to emotional processing.
  • The identified circuitry provides a substrate for how thalamic signals may influence emotional regulation and mood disorders.

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