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[[Category:Brainstem]]
[[Category:Brainstem]]
[[Category:Cranial nerves]]
[[Category:Cranial nerves]]
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[[Category:Neuroanatomy ]]
+
[[Category:Medulla oblongata ]]
{{BioPsy}}{{enWP|Nucleus ambiguus}}
{{BioPsy}}{{enWP|Nucleus ambiguus}}
Latest revision as of 16:41, June 17, 2006
Brain: Nucleus ambiguus
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue.
Nuclei of origin of cranial motor nerves schematically represented; lateral view.
Latin '
Gray's subject #187 779
Part of
Components
Artery
Vein
BrainInfo/UW hier-762
MeSH [1]
The nucleus ambiguus (literally "ambiguous nucleus") is a region of histologically disperse cells located just dorsal (posterior ) to the inferior olivary nucleus in the lateral portion of the upper (rostral ) medulla . This nucleus gives rise to the efferent motor fibers of the vagus nerve (CN X) terminating in the laryngeal and pharyngeal muscles, as well as to the efferent motor fibers of the glossopharyngeal nerve (CN IX) terminating in the stylopharyngeus .
The muscles supplied by the vagus (included with this is the cranial part of the accessory nerve ), such as levator veli palatini , are also necessary to swallow properly. The vagus also supplies the upper part of the oesophagus , and other parts of the pharynx and larynx .
As well as motor functions, nucleus ambiguus also contains the preganglionic neurons for the heart .
External links
Brain : rhombencephalon (hindbrain)
Metencephalon /pons
surface: Locus ceruleus
Trigeminal lemniscus (Dorsal trigeminal tract , Ventral trigeminal tract )
cranial nuclei :GSA : Principal V /Spinal V - VIII-c (Dorsal , Anterior )/VIII-v (Lateral , Superior , Medial , Inferior ) - SVE : Motor V - VII - GSE : VI - GVE : VII: Superior salivary nucleus
MLF, III, IV and VI (vestibulo-oculomotor fibers , medial vestibulospinal tract )
sensory/ascending: Trapezoid body/VIII - Superior olivary nucleus
Inferior cerebellar peduncle (Vestibulocerebellar tract )
motor/descending: Apneustic center • Pneumotaxic center (Medial parabrachial nucleus ) - Lateral parabrachial nucleus
Middle cerebellar peduncles (Pontocerebellar fibers ) - Pontine nuclei motor/descending: Corticospinal tract - Corticobulbar tract - Corticopontine fibers
Raphe/reticular
Reticular formation (Caudal , Oral , Tegmental , Paramedian ) • Raphe nuclei (Median )
Myelencephalon /medulla
Dorsal
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
Ventral
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
Raphe/reticular
Reticular formation (Gigantocellular , Parvocellular , Ventral , Lateral , Paramedian ) • Raphe nuclei (Obscurus , Magnus , Pallidus )
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