Organ
Nucleus of the solitary tract
Medullary processing of taste and internal-body signals
High-yield
Rostral regions principally process taste; caudal regions principally process visceral information. The nucleus participates in networks for breathing, cardiovascular regulation, swallowing, cough and other protective responses.
Overview
The nucleus of the solitary tract surrounds a fiber bundle in the dorsal medulla. Taste fibers from VII, IX and X reach its rostral region. More caudal regions process visceral inputs, including carotid sinus and body signals carried by IX and aortic cardiovascular signals carried by X. Its connections link sensory feedback to autonomic responses.
Reference facts
- Location
- Dorsal medulla, beside the dorsal motor nucleus of the vagus. A caudal commissural component extends across the midline.
- Parts
- A rostral gustatory region and multiple caudal visceral subnuclei, with some overlap in inputs and functions.
- Relations
- Near the vagal region of the fourth-ventricle floor and other dorsal medullary autonomic nuclei.
- Function
- Relays gustatory information toward the thalamus and cortex and integrates visceral feedback for cardiovascular, respiratory and digestive regulation.
Clinical correlation
A lateral medullary lesion can alter taste and disrupt networks that protect the airway. Dysphagia and aspiration risk usually reflect damage to several connected sensory and motor structures, rather than an isolated failure of this nucleus.
Frequently asked questions
Where is the nucleus of the solitary tract located?
Dorsal medulla, beside the dorsal motor nucleus of the vagus. A caudal commissural component extends across the midline.
What does the nucleus of the solitary tract do?
Relays gustatory information toward the thalamus and cortex and integrates visceral feedback for cardiovascular, respiratory and digestive regulation.
What are the parts of the nucleus of the solitary tract?
A rostral gustatory region and multiple caudal visceral subnuclei, with some overlap in inputs and functions.