Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Intergeniculate leaflet: an anatomically and functionally distinct subdivision of the lateral geniculate complex

R Y Moore1, J P Card

  • 1Department of Psychiatry, University of Pittsburgh, Pennsylvania 15261.

The Journal of Comparative Neurology
|June 15, 1994
PubMed
Summary

The intergeniculate leaflet (IGL) precisely regulates circadian rhythms by integrating visual input with other signals. This study defines IGL neuronal organization and its connections to the suprachiasmatic nucleus (SCN).

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

C1 catecholamine neurons form local circuit synaptic connections within the rostroventrolateral medulla of rat.

Neuroscience·2012
Same author

Organum vasculosum lamina terminalis: innervation by serotonin neurons of the midbrain raphe.

Neuroscience letters·2009
Same author

Substantia nigra dopamine neurons: separate populations project to neostriatum and allocortex.

Neuroscience letters·2009
Same author

Repair of the UL21 locus in pseudorabies virus Bartha enhances the kinetics of retrograde, transneuronal infection in vitro and in vivo.

Journal of virology·2008
Same author

Diagnostic performance of clinical motor and non-motor tests of Parkinson disease: a matched case-control study.

European journal of neurology·2008
Same author

Transneuronal circuit analysis with pseudorabies viruses.

Current protocols in neuroscience·2008

Area of Science:

  • Neuroscience
  • Circadian Biology
  • Neuroanatomy

Background:

  • The intergeniculate leaflet (IGL) is a key component of the lateral geniculate complex involved in circadian rhythm regulation.
  • It projects to the suprachiasmatic nucleus (SCN), the brain's primary circadian pacemaker.
  • Understanding IGL's structure and function is crucial for deciphering circadian control mechanisms.

Purpose of the Study:

  • To precisely define the intergeniculate leaflet (IGL) in rats.
  • To characterize its neuronal organization, including morphology, chemical phenotype, and connections.
  • To elucidate the synaptic organization of the IGL and its role in regulating the SCN.

Main Methods:

  • Golgi staining for neuronal morphology.
  • Neurotransmitter and neuropeptide analysis (GABA, neuropeptide Y, enkephalin).

Related Experiment Videos

  • Tracing of neuronal projections using anatomical techniques.
  • Analysis of synaptic organization and afferent inputs.

    • Main Results:

    • The IGL contains small to medium multipolar neurons with dendrites confined within the IGL.
    • Three distinct neuronal groups were identified based on neurotransmitter content and projections: GABA/NPY to SCN, GABA/enkephalin to contralateral IGL, and uncharacterized to SCN.
    • The IGL receives significant input from retinal ganglion cells and substance P, with projections from anterior hypothalamic and retrochiasmatic areas, as well as brainstem monoamine and cholinergic neurons.
    • Complex synaptic organization with glomerular formations and axoaxonic interactions, primarily on dendrites and spines.

    Conclusions:

    • The IGL is a structurally and chemically diverse nucleus.
    • Its intricate connections and synaptic organization support its role in integrating visual information for feedback regulation of the SCN.
    • This detailed characterization provides a foundation for further research into circadian rhythm mechanisms.