Nucleus ambiguus
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| Brain: Nucleus ambiguus | ||
|---|---|---|
 | ||
| Transverse section of medulla oblongata below the middle of the olive. ("Nucleus ambiguus" labeled at center right.) | ||
| Gray's | subject #187 779 | |
| NeuroNames | hier-762 | |
| Dorlands/Elsevier | n_11/12580164 | |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Phone:617-632-7753
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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.
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
 Section of the medulla oblongata at about the middle of the olive. |
 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. |
 Primary terminal nuclei of the afferent (sensory) cranial nerves schematically represented; lateral view. |
 The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive. |
External links
- Medical Neurosciences discuss the nucleus ambiguus.
- -1664090053 at GPnotebook
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
