Solitary nucleus
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| Brain: Solitary nucleus | ||
|---|---|---|
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| The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. | ||
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| Transverse section of medulla oblongata of human embryo. | ||
| Latin | tractus solitarius medullae oblongatae | |
| Gray's | subject # | |
| Part of | ||
| Components | ||
| Artery | ||
| Vein | ||
| BrainInfo/UW | hier-739 | |
| MeSH | A08.186.211.132.810.406.750 | |
The solitary nucleus and tract are structures in the brainstem that carry and receive visceral sensation and taste from the facial (VII), glossopharyngeal (IX), vagus (X) cranial nerves, as well as the cranial part of the accessory nerve (XI).
Contents |
[edit] Anatomy
The nucleus is located along the length of the medulla (with a small portion in the lower pons). The solitary tract runs in the middle of the nucleus, creating a speck of white matter (axons of the tract), surrounded by grey matter (the nucleus). This stands out on a stained section, which is where the name solitary comes from.
The solitary nucleus is divided into a rostral (towards the top) gustatory nucleus and caudal (towards the bottom) cardiorespiratory nucleus. The cardiorespiratory nucleus can be further divided into a cardiovascular center, which sits at the midline of the nucleus, and a respiratory center, which is located laterally.
[edit] Inputs to the solitary nucleus
As well as taste from nerves VII, IX and X, the solitary nucleus handles information from the carotid (from IX) and aortic bodies and baroreceptors (from X), which controls blood volume.
Information about the gut wall, as well as stretch of the lungs and dryness of mucous membranes, also synapses at the solitary nucleus.
[edit] Outputs from the solitary nucleus
From the solitary nucleus, most information goes to the hypothalamus and cingulate gyrus, as well as to other nuclei in the brainstem (such as visceral motor or respiratory centres). There is not much conscious awareness of visceral sensation (visceral pain is not part of this system), most results are reflexes or unconscious.
[edit] Additional images
 Section of the medulla oblongata at about the middle of the olive. |
 Nuclei of origin of cranial motor nerves schematically represented; lateral view. |
 Primary terminal nuclei of the afferent (sensory) cranial nerves schematically represented; lateral view. |
[edit] External links
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! Myelencephalon/
medulla
| colspan="1" style="text-align:left;width:100%;font-size:95%;background:#f7f7f7;" | {| class="navbox collapsible nowraplinks" style="margin:auto; background:white;background:white;"
|- style="text-align:center;width:100%;"
|- |- style="white-space:nowrap;background:#ddddff;text-align:right;padding-left:0em;padding-right:0em;background-color: LightYellow"
!| colspan="1" style="text-align:left;width:100%;font-size:95%;" | surface: Posterior median sulcus - Postero-lateral sulcus - Area postrema
cranial nuclei: GVA: VII,IX,X: Solitary/tract • SVA: Gustatory nucleus • GSE: XII • GVE: IX,X,XI: Ambiguus • SVE: X: Dorsal • IX: Inferior salivatory nucleus - MLF, III, IV and VI
sensory/ascending: Gracile nucleus • Cuneate nucleus (Accessory cuneate nucleus) • Sensory decussation • Medial lemniscus
motor/descending: Dorsal respiratory group
|- style="white-space:nowrap;background:#ddddff;text-align:right;padding-left:0em;padding-right:0em;background-color: LightYellow"
| colspan="1" style="text-align:left;width:100%;font-size:95%;background:#f7f7f7;" | motor/descending: Ventral respiratory group - Pyramid (Motor decussation) - Inferior olivary nucleus (Olivocerebellar tract, Rubro-olivary tract)
surface: Anterior median fissure - Antero-lateral sulcus - Arcuate nucleus of medulla - Olivary body
|- style="white-space:nowrap;background:#ddddff;text-align:right;padding-left:0em;padding-right:0em;background-color: LightYellow"
| colspan="1" style="text-align:left;width:100%;font-size:95%;" | Reticular formation (Gigantocellular, Parvocellular, Ventral, Lateral, Paramedian) • Raphe nuclei (Obscurus, Magnus, Pallidus) |} |}
| This page uses content from the English-language version of Wikipedia. The original article was at Solitary nucleus. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License. |
