Nucleus ambiguus
Encyclopedia : N : NU : NUC : Nucleus ambiguus
Brain: Nucleus ambiguus The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue.
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| colspan="2" |Nuclei of origin of cranial motor nerves schematically represented; lateral view.
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The nucleus ambiguus (literally "ambiguous nucleus") is a region of histologically disparate cell s 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
Rhombencephalon
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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