Interpeduncular nucleus

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Interpeduncular nucleus
Details
PartsApical subnucleus (IPA), Central subnucleus (IPC), Dorsolateral subnucleus (IPDL)x2, Dorsomedial subnucleus (IPDM)x2, Intermediate subnucleus (IPI)x2, Lateral subnucleus (IPL)x2, Rostral subnucleus (IPR)
Identifiers
Latinnucleus interpeduncularis
MeSHD066268
NeuroNames522
NeuroLex IDbirnlex_1000
TA98A14.1.06.313
TA25897
FMA72439
Anatomical terms of neuroanatomy

The interpeduncular nucleus (IPN) is an unpaired, ovoid cell group at the base of the

mesencephalon below the interpeduncular fossa. As the name suggests, the interpeduncular nucleus lies in between the cerebral peduncles
.

Composition

The Interpeduncular nucleus is primarily GABAergic and contains at least two neuron clusters of different morphologies.[1] The region is divided into 7 paired and unpaired subnuclei

Subdivisions

The presence of non-homologous subdivisions of the Interpeduncular nucleus was first noticed by Cajal over a hundred years ago.[2] The currently recognized standard subdivision notation was mostly established by Hammill and Lenn in 1984 by combining the work and notations of four groups.[3] Although most of their proposed convention stuck, at some point the proposed "rostral lateral" sub-nucleus was renamed "dorsomedial" and became immortalized in brain atlases.

  • Apical sub-nucleus (IPA)

Unpaired sub-nucleus. Former names include: "caudal dorsal", "dorsal", and "pars dorsalis magnocellularis".[3]

  • Central sub-nucleus (IPC)

Unpaired sub-nucleus. Former names include: "rostral ventral", "caudal central", "posterior inter", and "pars medianus".[3]

  • Dorsolateral sub-nucleus (IPDL)

Paired sub-nucleus.

  • Dorsomedial sub-nucleus (IPDM)

Paired sub-nucleus. Former names include: "rostral lateral" and "interstitial".[3]

  • Intermediate sub-nucleus (IPI)

Paired sub-nucleus. Former names include: "caudal intermediate", "posterior inner" and "pars medianus".[3]

  • Lateral sub-nucleus (IPL)

Paired sub-nucleus. Former names include: "caudal lateral", "paramedian" and "pars lateralis".[3]

  • Rostral sub-nucleus (IPR)

Unpaired sub-nucleus. Former names include: "central" and "pars dorsalis".[3]

Inputs

The major input to the IPN arrives via the fasciculus retroflex from the

Central grey, and the Locus coeruleus.[4]

Outputs

The major output pathways are inhibitory and project to the dorsal Tegmental area, the

Nucleus of diagonal band, the Preoptic area, the Ventral tegmental area, and in some species the dorsal and/or lateral Hypothalamus.[4]

Function

The Interpeduncular nucleus is thought to have a broad inhibitory effects on many other brain regions. IPN activity is linked with decreased dopamine release and utilization from dopamine producing regions.[5] The Interpeduncular nucleus is implicated with a role in the regulation of Rapid eye movement sleep.[6] Activation of the GAD2 expressing sub-population of the IPN produced the physical symptoms of nicotine withdrawal suggesting that the misfunction of this region may be an active component of withdrawal.[7]

See also

References

  1. PMID 7649781
  2. ^ Ramón y Cajal, Santiago (1909). Histologie du Système Nerveux de l'Homme et des Vertébrés, L. Azoulay, trans. Paris: Maloine. Translated into English as Histology of the Nervous System of Man and Vertebrates (1995). New York: Oxford University Press.
  3. ^
    PMID 6478267
    .
  4. ^
    PMID 2433243
    .
  5. PMID 2424555
    .
  6. ^ Funato, Hiromasa (2010), Loss of Goosecoid-like and DiGeorge syndrome critical region 14 in interpeduncular nucleus results in altered regulation of rapid eye movement sleep, University of Texas Southwestern Medical Center, Dallas: PNAS
  7. PMID 24239118
    .

External links
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