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Gracile nucleus

Encyclopedia : G : GR : GRA : Gracile nucleus


Section of the medulla oblongata at the level of the decussation of the pyramids. Gracile nucleus is #8. |- style="text-align: center;" class="hiddenStructure" | colspan="2" |

|- style="text-align: center; line-height: 1;" class="hiddenStructure" | colspan="2" |Dissection of brain-stem. Dorsal view. ("nucleus gracilis" is labeled on left, second from the bottom.) |- class="hiddenStructure" |Latin |colspan="2"|nucleus gracilis |- class="hiddenStructure" | |colspan="2"|[subject #187 ] |- class="hiddenStructure" |Part of |colspan="2"| |- class="hiddenStructure" |Components |colspan="2"| |- class="hiddenStructure" |Artery |colspan="2"| |- class="hiddenStructure" |Vein |colspan="2"| |- class="hiddenStructure" |Acronym(s) |colspan="2"| |- class="hiddenStructure" |NeuroNames |colspan="2"|[hier-763] |- class="hiddenStructure" |MeSH |colspan="2"|[] |- class="hiddenStructure" |Dorlands/Elsevier |colspan="2"|[/] |}

Located in the medulla oblongata, the gracile nucleus (or nucleus gracilis) is one of the dorsal column nuclei that participates in the sensation of fine touch and proprioception. It contains second-order neurons of the dorsal column-medial lemniscus system which receive inputs from sensory neurons of the dorsal root ganglia and send axons that synapse in the thalamus.

The neurons contained within the nucleus form a visible bump called the gracile tubercle on the posterior side of the closed medulla at the floor of the fourth ventricle.

External links

Brain: Gracile nucleus
Rhombencephalon (hindbrain)

MYELENCEPHALON/MEDULLA: arcuate nucleus of medulla, solitary nucleus, hypoglossal nucleus, nucleus ambiguus, olivary body, cuneate nucleus, accessory cuneate nucleus, gracile nucleus, inferior salivatory nucleus, nucleus raphe obscurus, nucleus raphe magnus, nucleus raphe pallidus, area postrema

METENCEPHALON/CEREBELLUM: cerebellar vermis, flocculus, arbor vitae

METENCEPHALON/PONS: pontine tegmentum, superior salivary nucleus, trapezoid body, pontine nuclei (superior olivary nucleus, trigeminal nerve nuclei, abducens nucleus, facial motor nucleus, cochlear nuclei, vestibular nuclei), locus ceruleus, paramedian pontine reticular formation, nucleus centralis superior

FOURTH VENTRICLE: obex, median aperture

 


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