What is the Ambiguus nucleus?
Introduction. The nucleus ambiguus is the common nucleus of the efferent fibers for glossopharyngeal (CN IX) and vagus (CN X) nerves. The name ‘ambiguus’ originates from its difficult-to-find location and variation in different species. Its location is in the reticular formation in the medulla oblongata.
Is Ambiguus GVE a nucleus?
Nucleus ambiguus also provides parasympathetic GVE innervation to the carotid body and carotid sinus through the glossopharyngeal nerve, and to the heart and aortic bodies through the vagus nerve.
What are the sensory nucleus of the brainstem?
In the brainstem, there are about 18 cranial nerve nuclei comprising of 10 motor cranial nerve nuclei and 8 sensory cranial nerve nuclei. The functions of those cranial nerves are suggestive of the functions of the parts of the brainstem they are located.
Where is Ambiguus located?
rostral medulla
The nucleus ambiguus is a paired nucleus located in the lateral aspect of the rostral medulla. It lies dorsal to the inferior olivary nucleus and ventromedial to the spinal nucleus and tract of the trigeminal nerve (CN V). It is located medial to the lateral spinothalamic tract.
What is the dorsal motor nucleus of the vagus?
The dorsal vagal nucleus, also known as the vagal nucleus, dorsal nucleus of the vagus nerve or the dorsal motor nucleus of the vagus nerve, is a elongated nucleus within the medulla oblongata that provides parasympathetic motor innervation to the viscera of the thorax and abdomen.
Why is it called Edinger-Westphal nucleus?
Eponym. The nucleus is named for both Ludwig Edinger, from Frankfurt, who demonstrated it in the fetus in 1885, and for Karl Friedrich Otto Westphal, from Berlin, who demonstrated it in the adult in 1887.
Where is Edinger-Westphal nucleus?
midbrain
The EWpg is what is thought of as the classic ONC—sending parasympathetic nerve fibers towards the eye. It is located in the midbrain immediately dorsal to the oculomotor nucleus near the level of the superior colliculus, which is why it is often included in the overarching term oculomotor complex.
What is Edinger-Westphal nucleus?
1 The Edinger–Westphal nucleus. EW is a distinct nucleus of the midbrain, lying immediately dorsal to the oculomotor complex. It is located just slightly ventral and lateral to the cerebral aqueduct at the level of the superior colliculus (Figure 1).
What is the difference between ganglia and nuclei?
These functional units are present in both central nervous system (CNS) and peripheral nervous system (PNS). The main difference between ganglia and nuclei is that ganglia are clusters of nerve cell bodies in the PNS whereas nuclei are clusters of nerve cell bodies in the CNS.
What are the nucleus of vagus nerve?
The vagal nucleus consists of four nuclei located in the medulla oblongata. The three main nuclei are the dorsal motor nucleus of the vagus nerve (cranial nerve [CN] X), nucleus ambiguus, and the solitary nucleus.
What is the laterodorsal tegmental nucleus?
The laterodorsal tegmental nucleus (LDTg) borders the locus coeruleus and the DTg through some of its course (Figures 8.42–8.50 ). It outdistances the DTg caudally and especially rostrally where its ventral part persists until DTg compact part is fully displayed ( Figure 8.43 ).
What is the nucleus ambiguus?
The nucleus ambiguus is the common nucleus of the efferent fibers for glossopharyngeal (CN IX) and vagus (CN X) nerves. The name ‘ambiguus’ originates from its difficult-to-find location and variation in different species.
What innervates the nucleus ambiguus?
The nucleus ambiguus contains the cell bodies of neurons that innervate the muscles of the soft palate, pharynx, and larynx which are associated with speech and swallowing. As well as motor neurons, the nucleus ambiguus contains preganglionic parasympathetic neurons which innervate postganglionic parasympathetic neurons in the heart.
What are the symptoms of nucleus ambiguus lesion?
Lesions of nucleus ambiguus results in nasal speech, dysphagia, dysphonia, and deviation of the uvula toward the contralateral side. Preganglionic parasympathetics to the heart also flow through the external formation of the nucleus.