Просмотр кода страницы Английская Википедия:Anterior external arcuate fibers

{{Английская Википедия/Панель перехода}}
{{Confusing|date=April 2009}}
{{Infobox Brain
| Name = Anterior external arcuate fibers
}}

{{Infobox anatomy
| Name        = Anterior external arcuate fibers
| Latin       = fibrae arcuatae externae anteriores
| Image       = Gray699.png
| Caption     = Diagram showing the course of the arcuate fibers. (Testut.) 1. [[Medulla oblongata]] anterior surface. 2. [[Anterior median fissure of the medulla oblongata|Anterior median fissure]]. 3. [[Fourth ventricle]]. 4. [[Inferior olivary nucleus]], with the [[accessory olivary nuclei]]. 5. [[Gracile nucleus]]. 6. [[Cuneate nucleus]]. 7. [[Trigeminal]]. 8. [[Inferior peduncles]], seen from in front. 9. [[Posterior external arcuate fibers]]. 10. Anterior external arcuate fibers. 11. [[Internal arcuate fibers]]. 12. Peduncle of [[inferior olivary nucleus]]. 13. [[Nucleus arcuatus]]. 14. [[Vagus]]. 15. [[Hypoglossal]].
| Image2      = Gray694.png
| Caption2    = Section of the [[medulla oblongata]] at about the middle of the [[olive]]. (Arcuate fibers labeled at center right.)
| System      =
| Precursor   =
}}
The '''anterior external arcuate fibers''' ('''ventral external arcuate fibers''') vary as to their prominence: in some cases they form an almost continuous layer covering the [[medullary pyramids (brainstem)|medullary pyramids]] and [[olivary body]], while in other cases they are barely visible on the surface.

Most of them reach the surface by way of the [[Anterior median fissure of the medulla oblongata|anterior median fissure]], and arch backward over the pyramid.

Reinforced by others which emerge between the pyramid and olive, they pass backward over the olive and lateral district of the [[medulla oblongata]], and enter the [[inferior peduncle]].

As the fibers arch across the pyramid, they enclose a small nucleus which lies in front of and medial to the pyramid.

This is named the [[arcuate nucleus]], and is serially continuous above with the [[pontine nuclei]] in the [[pons]]; it contains small fusiform (spindle-shaped) cells, around which some of the arcuate fibers end, and from which others arise.

==Additional images==
<gallery>
 Image:Gray700.png|The [[reticular formation]] shown by a transverse section passing through the middle of the olive.
</gallery>

==References==
{{Gray's}}

==External links==
* {{BrainInfo|hier|794}}

{{Medulla and pons of rhombencephalon}}

[[Category:Medulla oblongata]]


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