What is Ambiguus nucleus?
What is Ambiguus nucleus?
The nucleus ambiguus is the location of cell bodies of motor nerves that innervate the ipsilateral muscles of the soft palate, pharynx, larynx and upper esophagus and are mainly responsible for swallowing and speaking.
What does nucleus tractus Solitarius do?
Nucleus tractus solitarius is involved in generating and synchronizing the peristaltic activity of the upper gastrointestinal tract during swallowing. The rhythmic release of inhibitory (GABA) and excitatory (glutamate) neurotransmitters is responsible for the sequential motor pattern seen in peristalsis.
What cranial nerves are associated with the nucleus ambiguus?
This nucleus gives rise to the branchial efferent motor fibers of the vagus nerve (CN X) terminating in the laryngeal, pharyngeal muscles, and musculus uvulae; as well as to the efferent motor fibers of the glossopharyngeal nerve (CN IX) terminating in the stylopharyngeus muscle.
What is function of NTS in brain?
Recent findings suggest that the neurons of the nucleus of the solitary tract (NTS), in the dorsal medulla, are essential for the processing and coordination of respiratory and sympathetic responses to hypoxia.
What is NTS respiratory?
Where is NTS brain?
dorsomedial medulla oblongata
The nucleus tractus solitarius (NTS) is the principal visceral sensory nucleus in the brain and comprises neurochemically and biophysically distinct neurons located in the dorsomedial medulla oblongata.
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 receives corticobulbar fibers from both hemispheres and is the efferent innervation to the stylopharyngeus muscle, which contributes toward the elevation of the pharynx and larynx.
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.
What causes the nucleus ambiguus to compromise?
Lesions and ischemic events that affect the lateral medulla may compromise the nucleus ambiguus. Lateral medullary syndrome, also known as Wallenberg syndrome or PICA syndrome, is a constellation of neurological symptoms that occurs due to ischemia in the lateral part of the medulla.