Everything about The Nucleus Ambiguus totally explained
The
nucleus ambiguus (literally "ambiguous nucleus") is a region of
histologically disparate
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 and the
accessory nerve (CN XI) which innervates other muscles of the soft palate and
pharynx.
Areas supplied
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 through integration by the nucleus of the
solitary tract. The vagus also supplies the upper part of the
esophagus, and other parts of the
pharynx and
larynx.
As well as motor functions, nucleus ambiguus also contains the preganglionic neurons for the
heart.
Additional images
Image:Gray694.png|Section of the medulla oblongata at about the middle of the olive.
Image:Gray696.png|The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue.
Image:Gray697.png|Nuclei of origin of cranial motor nerves schematically represented; lateral view.
Image:Gray700.png|The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.
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