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{{about|the structure in the medulla oblongata|the hypothalamic structure|Arcuate nucleus}}
{{about|the structure in the medulla oblongata|the hypothalamic structure|Arcuate nucleus (hypothalamus)}}
{{Infobox Brain|
{{Infobox brain
Name = Arcuate nucleus (medulla) |
| Name = Arcuate nucleus (medulla)
Latin = nucleus arcuatus medullae oblongatae |
| Latin = nucleus arcuatus medullae oblongatae
⚫
| Image = Gray695.png
GraySubject = 187 |
| Caption = [[Transverse plane|Transverse]] section of [[medulla oblongata]] below the middle of the olive. ("Nucleus arcuatus" visible near bottom right.)
GrayPage = 767 |
Image = Gray695.png |
| Image2 = Gray683.png
Caption = [[Transverse plane|Transverse]] section of [[medulla oblongata]] below the middle of the olive. ("Nucleus arcuatus" visible near bottom right.) |
| Caption2 = Dissection of brain-stem. Lateral view. (Labels for "External arcuate fibers" and "Dorsal external arcuate fibers" visible at lower right.)
Image2 = Gray683.png |
| IsPartOf =
| Components =
Caption2 = Dissection of brain-stem. Lateral view. (Labels for "External arcuate fibers" and "Dorsal external arcuate fibers" visible at lower right.) |
IsPartOf = |
| Artery =
Components = |
| Vein =
Artery = |
⚫
Vein = |
BrainInfoType = hier |
BrainInfoNumber = 772 |
MeshName = |
MeshNumber = |
NeuroLex = Arcuate nucleus of medulla |
NeuroLexID = birnlex_2635 |
DorlandsPre = n_11 |
DorlandsSuf = 12580396 |
}}
}}


In the [[medulla oblongata]], the '''arcuate nucleus''' is a group of [[neuron]]s located on the anterior surface of the medullary pyramids. These nuclei are the extension of the [[pontine nuclei]]. They receive fibers from the [[corticospinal tract]] and send their axons through the [[anterior external arcuate fibers]] and [[striae medullares]] to the [[cerebellum]] via the [[inferior cerebellar peduncle]].
In the [[medulla oblongata]], the '''arcuate nucleus''' is a group of [[neuron]]s located on the anterior surface of the [[medullary pyramids (brainstem)|medullary pyramids]]. These nuclei are the extension of the [[pontine nuclei]].<ref name=":2242">{{Cite book |last=Standring |first=Susan |url=https://www.worldcat.org/oclc/1201341621 |title=Gray's Anatomy: The Anatomical Basis of Clinical Practice |publisher=[[Elsevier]] |year=2020 |isbn=978-0-7020-7707-4 |edition=42th |location=New York |pages=445.e1 |oclc=1201341621}}</ref>


They receive afferents from the [[corticospinal tract]].{{Citation needed|date=July 2024}}
Arcuate nuclei are capable of chemosensitivity and have a proven role in controlling respiratory frequency.

They in turn project efferents into the [[cerebellum]] through the [[inferior cerebellar peduncle]] as:<ref name=":2242" />

* the [[anterior internal arcuate fibers]] which pass along the midline before decussating near the [[Rhomboid fossa|rhomboid fossa (floor of fourth ventricle)]] then passing laterally as the [[Medullary striae of fourth ventricle|medullary striae]];
* the [[anterior external arcuate fibers]].

== Function ==
Arcuate nuclei are capable of [[chemoreceptor|chemosensitivity]] and have a proven role in the [[respiratory center]] controlling the [[respiratory rate|breathing rate]].<ref name="Paradiso2018">{{cite journal |last1=Paradiso |first1=B |last2=Ferrero |first2=S |last3=Thiene |first3=G |last4=Lavezzi |first4=AM |title=Variability of the medullary arcuate nucleus in humans. |journal=Brain and Behavior |date=November 2018 |volume=8 |issue=11 |pages=e01133 |doi=10.1002/brb3.1133 |pmid=30329220|hdl=11577/3281424 |hdl-access=free }}</ref>


==Additional images==
==Additional images==
<gallery>
<gallery>
Image:Gray699.png|Diagram showing the course of the arcuate fibers.
File:Gray699.png|Diagram showing the course of the arcuate fibers.
Image:Gray700.png|The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.
File:Gray700.png|The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.
</gallery>
</gallery>


==External links==
==External links==
* {{LoyolaMedEd|Neuro/frames/nlBSs/nl31fr.htm}}
* {{LoyolaMedEd|Neuro/frames/nlBSs/nl31fr.htm}}
* [http://www.ncbi.nlm.nih.gov/pubmed/17950558 PubMed article]
* [https://www.ncbi.nlm.nih.gov/pubmed/17950558 PubMed article]

== References ==
⚫
{{Reflist}}{{Rhombencephalon}}
{{Authority control}}


[[Category:Respiratory physiology]]
⚫
{{Rhombencephalon}}
⚫
[[Category:Medulla oblongata]]




{{neuroscience-stub}}
{{neuroanatomy-stub}}
⚫
[[Category:Neurons]]

Latest revision as of 01:07, 29 September 2024

This article is about the structure in the medulla oblongata. For the hypothalamic structure, see Arcuate nucleus (hypothalamus).
Arcuate nucleus (medulla)
Transverse section of medulla oblongata below the middle of the olive. ("Nucleus arcuatus" visible near bottom right.)
Dissection of brain-stem. Lateral view. (Labels for "External arcuate fibers" and "Dorsal external arcuate fibers" visible at lower right.)
Details
Identifiers
Latinnucleus arcuatus medullae oblongatae
NeuroNames775
NeuroLex IDbirnlex_2635
TA98A14.1.04.256
TA26016
FMA72609
Anatomical terms of neuroanatomy

In the medulla oblongata, the arcuate nucleus is a group of neurons located on the anterior surface of the medullary pyramids. These nuclei are the extension of the pontine nuclei.[1]

They receive afferents from the corticospinal tract.[citation needed]

They in turn project efferents into the cerebellum through the inferior cerebellar peduncle as:[1]

Function

[edit]

Arcuate nuclei are capable of chemosensitivity and have a proven role in the respiratory center controlling the breathing rate.[2]

Additional images

[edit]
  • Diagram showing the course of the arcuate fibers.
    Diagram showing the course of the arcuate fibers.
  • The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.
    The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.
[edit]

References

[edit]
  1. ^ a b Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York: Elsevier. p. 445.e1. ISBN 978-0-7020-7707-4. OCLC 1201341621.
  2. ^ Paradiso, B; Ferrero, S; Thiene, G; Lavezzi, AM (November 2018). "Variability of the medullary arcuate nucleus in humans". Brain and Behavior. 8 (11): e01133. doi:10.1002/brb3.1133. hdl:11577/3281424. PMID 30329220.


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