Deep cerebellar nuclei

Deep cerebellar nuclei
Sagittal section through right cerebellar hemisphere. The right olive has also been cut sagittally. (Nucleus dentatus labeled at center top.)
Microcircuitry of the cerebellum. Excitatory synapses are denoted by (+) and inhibitory synapses by (-). MF: Mossy fiber. DCN: Deep cerebellar nuclei. IO: Inferior olive. CF: Climbing fiber. GC: Granule cell. PF: Parallel fiber. PC: Purkinje cell. GgC: Golgi cell. SC: Stellate cell. BC: Basket cell.
Details
Part of	Cerebellum
Parts	Dentate nucleus, Emboliform nucleus, Fastigial nucleus, Globose nucleus
Artery	Superior cerebellar
Identifiers
Latin	nuclei cerebelli
MeSH	D002529
NeuroNames	682
NeuroLex ID	birnlex_1568
TA98	A14.1.07.406
TA2	5835
FMA	72249
Anatomical terms of neuroanatomy [edit on Wikidata]

There are four paired deep cerebellar nuclei embedded in the white matter of the medullary centre. The nuclei are the fastigial, globose, emboliform, and dentate nuclei.

Inputs

These nuclei receive inhibitory (GABAergic) inputs from Purkinje cells in the cerebellar cortex and excitatory (glutamatergic) inputs from mossy fiber and climbing fiber pathways. Most output fibers of the cerebellum originate from these nuclei. One exception is that fibers from the flocculonodular lobe synapse directly on vestibular nuclei without first passing through the deep cerebellar nuclei. The vestibular nuclei in the brainstem are analogous structures to the deep nuclei, since they receive both mossy fiber and Purkinje cell inputs. ^[1]

Specific nuclei

From lateral to medial, the four deep cerebellar nuclei are the dentate, emboliform, globose, and fastigial. Some animals, including humans, do not have distinct emboliform and globose nuclei, instead having a single, fused interposed nucleus.^{[citation needed]} In animals with distinct emboliform and globose nuclei, the term interposed nucleus is often used to refer collectively to these two nuclei.

Topography

In general, each pair of deep nuclei is associated with a corresponding region of cerebellar surface anatomy.

• 
  Cross-section of human cerebellum, showing the dentate nucleus, as well as fourth ventricle
• 
  Cross-section of human cerebellum, showing the dentate nucleus and cross-section of vermis

• The dentate nuclei are deep within the lateral hemispheres,
• the interposed nuclei are located in the paravermal (intermediate) zone,
• and the fastigial nuclei are in the vermis.

These structural relationships are generally maintained in the neuronal connections between the nuclei and associated cerebellar cortex,

• with the dentate nucleus receiving most of its connections from the lateral hemispheres,
• the interposed nuclei receiving inputs mostly from the paravermis,
• and the fastigial nucleus receiving primarily afferents from the vermis.

References

External links

• Illustration and text: cere/text/P5/intro.htm at the University of Wisconsin-Madison Medical school
• https://web.archive.org/web/20150621011739/http://www.mona.uwi.edu/fpas/courses/physiology/neurophysiology/Cerebellum.htm