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← Older revision		Revision as of 11:32, 18 February 2025
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	[[Category:Neuroanatomy]]		[[Category:Neuroanatomy]]
	[[Category:Cranial nerve nuclei]]		[[Category:Cranial nerve nuclei]]
			== Abducens_nucleus ==
			<gallery>
			File:Gray696.svg\|Abducens nucleus
			File:Gray697.png\|Abducens nucleus
			File:Gray774.png\|Abducens nucleus
			File:Gray785.png\|Abducens nucleus
			File:Pons_section_at_facial_colliculus.png\|Abducens nucleus
			File:ThreeNeuronArc.png\|Abducens nucleus
			File:Brain_stem_sagittal_section.svg\|Abducens nucleus
			File:Lower_pons_horizontal_KB.svg\|Abducens nucleus
			</gallery>

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== Abducens nucleus ==

[[File:Gray696.svg|thumb|Diagram of the cranial nerve nuclei, with the abducens nucleus labeled.]]

The '''abducens nucleus''' is a collection of [[neurons]] located in the [[pons]], a part of the [[brainstem]]. It is responsible for controlling the [[lateral rectus muscle]] of the [[eye]], which is involved in [[eye movement]]. The abducens nucleus is associated with the [[abducens nerve]] (cranial nerve VI), which innervates the lateral rectus muscle.

== Anatomy ==

[[File:Gray697.png|thumb|Section of the pons showing the location of the abducens nucleus.]]

The abducens nucleus is situated in the caudal part of the pons, near the midline, and beneath the floor of the [[fourth ventricle]]. It is located at the level of the [[facial colliculus]], which is formed by the fibers of the [[facial nerve]] (cranial nerve VII) looping over the abducens nucleus.

== Function ==

The primary function of the abducens nucleus is to control the lateral rectus muscle, which abducts the eye, meaning it moves the eye away from the midline. This action is crucial for [[horizontal gaze]] and coordination of eye movements.

== Neural connections ==

[[File:Gray774.png|thumb|Diagram showing the connections of the abducens nucleus.]]

The abducens nucleus receives input from the [[paramedian pontine reticular formation]] (PPRF), which is involved in horizontal gaze control. It also has connections with the [[oculomotor nucleus]] via the [[medial longitudinal fasciculus]] (MLF), allowing for coordinated movement of both eyes.

== Clinical significance ==

Lesions affecting the abducens nucleus can result in [[horizontal gaze palsy]] or [[internuclear ophthalmoplegia]], depending on the extent and location of the damage. Such lesions can be caused by [[stroke]], [[multiple sclerosis]], or other neurological disorders.

== Related structures ==

The abducens nucleus is closely related to the [[facial nerve]] due to its anatomical proximity. The fibers of the facial nerve loop over the abducens nucleus, forming the facial colliculus. This relationship is important in understanding certain clinical syndromes, such as [[Millard-Gubler syndrome]], where both the abducens and facial nerves are affected.

== Related pages ==

* [[Abducens nerve]]
* [[Pons]]
* [[Cranial nerves]]
* [[Eye movement]]

== Gallery ==

<gallery>
File:Gray785.png|Diagram of the brainstem showing the abducens nucleus.
File:Pons_section_at_facial_colliculus.png|Cross-section of the pons at the level of the facial colliculus.
File:ThreeNeuronArc.png|Diagram illustrating the neural pathways involving the abducens nucleus.
File:Brain_stem_sagittal_section.svg|Sagittal section of the brainstem showing the location of the abducens nucleus.
File:Lower_pons_horizontal_KB.svg|Horizontal section of the lower pons showing the abducens nucleus.
</gallery>

[[Category:Neuroanatomy]]
[[Category:Cranial nerve nuclei]]

Abducens nucleus - Revision history

Prab: CSV import

Prab: CSV import