Solitary nucleus

Solitary nucleus is a structure located in the brainstem that is primarily involved in the autonomic nervous system. It is also known as the nucleus solitarius or nucleus of the solitary tract.

Anatomy

The solitary nucleus is located in the medulla oblongata, a part of the brainstem. It extends from the level of the pons to the lower border of the medulla. The nucleus is situated close to the midline, embedded within the solitary tract.

Function

The solitary nucleus is involved in several important functions. It receives sensory information from chemoreceptors and baroreceptors in the body. These receptors monitor the levels of oxygen and carbon dioxide in the blood, as well as blood pressure. The solitary nucleus also receives input from the gastrointestinal tract, allowing it to play a role in the regulation of digestion.

In addition, the solitary nucleus is involved in the sense of taste. It receives taste information from the anterior two-thirds of the tongue via the facial nerve, and from the posterior one-third of the tongue via the glossopharyngeal nerve.

Clinical significance

Damage to the solitary nucleus can result in a variety of symptoms, depending on the extent and location of the damage. These can include difficulties with swallowing, changes in heart rate and blood pressure, and loss of taste sensation.

See also

• Brainstem
• Medulla oblongata
• Autonomic nervous system
• Chemoreceptor
• Baroreceptor
• Gastrointestinal tract
• Facial nerve
• Glossopharyngeal nerve