Question: What Does The Left Recurrent Laryngeal Nerve Innervate?

How do you know if you have a recurrent laryngeal nerve?

Most often, the nerve is found in a groove between the tubercle and the lobe of the thyroid gland.

As described before, both the left and right nerve follow closely with the course of the inferior thyroid artery, and this landmark can also help identify the nerve..

What causes recurrent laryngeal nerve paralysis?

In 134 patients with recurrent laryngeal nerve paralysis, the left recurrent nerve was most commonly involved. Malignant neoplasms of the lung and pulmonary tuberculosis were the most frequent causes of the paralysis.

What is the recurrent laryngeal nerve?

The recurrent laryngeal nerve (RLN), also known as the inferior laryngeal nerve, is a branch of the vagus nerve (CN X) which has a characteristic loop around the right subclavian artery on the right and the aortic arch on the left before returning up to achieve the tracheoesophageal groove and then the larynx.

What nerve can be damaged during thyroidectomy?

Injury to the Superior Laryngeal Nerve The external branch of the superior laryngeal nerve (SLN) is probably the nerve most commonly injured in thyroid surgery, with an injury rate estimated at 0-25%.

What is laryngeal level?

Location. In adult humans, the larynx is found in the anterior neck at the level of the C3–C6 vertebrae. It connects the inferior part of the pharynx (hypopharynx) with the trachea.

What part of the brain controls the vocal cords?

frontal lobeOn June 28 in the journal Cell, researchers at the University of California, San Francisco narrow in on a region of the brain’s frontal lobe that controls the “voice box” muscles that are responsible for vocal pitch. “Our overall goal is to understand how the brain allows us to communicate through speech and language.

Which muscles are innervated by the recurrent laryngeal nerve?

Function. The recurrent laryngeal nerves control all intrinsic muscles of the larynx except for the cricothyroid muscle. These muscles act to open, close, and adjust the tension of the vocal cords, and include the posterior cricoarytenoid muscles, the only muscle to open the vocal cords.

What is the function of the recurrent laryngeal nerves?

The recurrent laryngeal nerve (RLN) branches off the vagus nerve (cranial nerve X) and has an indirect course through the neck. It supplies innervation to all of the intrinsic muscles of the larynx, except for the cricothyroid muscles, as well as sensation to the larynx below the level of the vocal cords.

How do you treat a recurrent laryngeal nerve injury?

The late treatment methods of RLN injury include thyroplasty, injection into and near vocal cords and arytenoid adduction, in order to move the vocal cords inward and to improve the voice; and laser arytenoidectomy, cordectomy, vocal cord abduction and fixation in order to expand glottis and improve the dyspnea.

What is non recurrent laryngeal nerve?

A nonrecurrent laryngeal nerve (NRLN) is a rare anatomical variation in which the nerve enters the larynx directly from the cervical vagus nerve, without descending to the thoracic level [2]. It has been reported in 0.3-0.8% of the population on the right side, being extremely rare on the left side (0.004%) [3].

Where is the laryngeal located?

The larynx is located within the anterior aspect of the neck, anterior to the inferior portion of the pharynx and superior to the trachea.

What is the function of the extrinsic laryngeal muscles?

The extrinsic muscles act to move the larynx superiorly and inferiorly. They are comprised of the suprahyoid and infrahyoid groups, and the stylopharyngeus (a muscle of the pharynx). The supra- and infrahyoid muscle groups attach to the hyoid bone.

What does the inferior laryngeal nerve innervate?

The inferior laryngeal nerve (RLN) runs in the tracheoesophageal groove toward the larynx, close to the posterior aspect of the thyroid. It is the main motor nerve of the intrinsic laryngeal muscles, and also provides sensory innervation to the larynx.

Where does the left recurrent laryngeal nerve arise?

The left recurrent laryngeal nerve arises from the vagus to the left of the arch of the aorta. It curves inferior to the aortic arch and ascends in the groove between the trachea and the esophagus.

Which cranial nerve controls vocal cords?

vagus nerveThe nerve that controls motion to the vocal folds is called cranial nerve X (also known as the vagus nerve). You can think of nerves like the electrical wiring to the voice box. The branch that controls the opening and closing of the vocal folds is called the recurrent laryngeal nerve.

Why is the left recurrent laryngeal nerve more vulnerable to damage?

Relationship of the recurrent nerve to the inferior thyroid artery. The nerve often passes anterior, posterior, or through the branches of the inferior thyroid artery. Medial traction of the thyroid lobe often lifts the nerve anteriorly, thereby making it more vulnerable.

What is laryngeal nerve palsy?

Laryngeal nerve palsy: Paralysis of the larynx (voice box) caused by damage to the recurrent laryngeal nerve or its parent nerve, the vagus nerve, which originates in the brainstem and runs down to the colon.

How long does it take to heal damaged vocal cords?

You need to allow time for your vocal folds to heal before returning to full voice use. If you are a singer or do use your voice a lot, you may need four to six weeks of careful voice use for a full recovery, he says.

What is recurrent laryngeal nerve palsy?

Vocal cord paresis, also known as recurrent laryngeal nerve paralysis or vocal fold paralysis, is an injury to one or both recurrent laryngeal nerves (RLNs), which control all muscles of the larynx except for the cricothyroid muscle. The RLN is important for speaking, breathing and swallowing.

What does the internal laryngeal nerve supply?

The internal laryngeal nerve supplies sensation to the mucosa from the epiglottis to just above the level of the vocal folds. (The recurrent laryngeal nerve supplies sensation from the rest of the larynx below the level of the vocal folds). It pierces the thyrohyoid membrane above the superior laryngeal artery.

What are the laryngeal muscles?

Muscles of the larynxExtrinsic muscles, which produce the movements of the hyoid bone. These are the infrahyoid (sternohyoid, omohyoid, sternothyroid, thyrohyoid) and suprahyoid muscles (stylohyoid, digastric, mylohyoid, geniohyoid)Intrinsic muscles, which move the vocal cords in order to produce speech sounds.