Auricular branch of vagus nerve

Auricular Branch of Vagus Nerve

Diagram of the auricular branch of the vagus nerve

The auricular branch of the vagus nerve, also known as the Arnold's nerve, is a branch of the vagus nerve (cranial nerve X) that supplies sensation to the skin of the ear canal and part of the auricle. It is a small nerve that plays a role in the sensory innervation of the ear.

Anatomy

The auricular branch of the vagus nerve arises from the superior ganglion of the vagus nerve. It travels through the jugular foramen and enters the mastoid canaliculus in the temporal bone. The nerve then emerges from the tympanomastoid fissure to reach the external ear.

Pathway

The nerve passes through the temporal bone and emerges to supply the skin of the auricle and the external acoustic meatus. It communicates with the facial nerve and the glossopharyngeal nerve to provide sensory innervation to the ear.

Function

The primary function of the auricular branch of the vagus nerve is to provide sensory innervation to the skin of the ear canal and part of the auricle. It is responsible for transmitting sensory information, including pain and temperature, from the ear to the brain.

Clinical Significance

Stimulation of the auricular branch of the vagus nerve can lead to a reflex known as the "Arnold's reflex," which may cause coughing or a sensation of tickling in the throat. This reflex is due to the connection between the auricular branch and the vagus nerve, which also innervates the larynx and pharynx.

In some cases, irritation or damage to the auricular branch can lead to referred pain in the ear, known as "vagal ear pain." This can occur due to various conditions affecting the vagus nerve or its branches.

Related Pages

• Vagus nerve
• Facial nerve
• Glossopharyngeal nerve
• Jugular foramen
• Temporal bone