Where does laryngeal nerve branch from?
The superior laryngeal nerve arises from the inferior ganglion and descends against the lateral wall of the pharynx, along the posterior and then medial surface of the internal carotid artery. It divides into the external and internal laryngeal nerve branches (Fig. 22.4).
Where does the superior laryngeal nerve branch?
The superior laryngeal nerve arises from the inferior ganglion of the vagus. It descends lateral to the pharynx, at first posterior and then medial to the ICA. At the level of greater horn of hyoid, the superior laryngeal nerve divides into a smaller external laryngeal nerve and a larger internal laryngeal nerve.
Do spinal nerves innervate the larynx?
The pharyngeal constrictors and palatopharyngeus receive innervation from the glossopharyngeal, vagus, and spinal accessory nerve via the “pharyngeal plexus.” Extrinsic muscles that attach directly to the larynx: Sternothyroid muscle: attaches to the anterolateral aspect of the thyroid and sternum.
What are the laryngeal nerves?
The vagus nerve is the large nerve that supplies the many branches of nerves that innervate the larynx. The superior laryngeal nerve, its external and internal branches, and the recurrent laryngeal nerve all have very distinct roles in motor and sensory innervation of the larynx.
What are the 3 important laryngeal muscles?
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.
What symptom is noted when the superior laryngeal nerve is damaged?
Damage to the nerves of the larynx can cause hoarseness, difficulty in swallowing or breathing, or the loss of voice. Treatment depends on the cause and extent of the laryngeal nerve damage. Damage to the laryngeal nerve can result in loss of voice or obstruction to breathing.
What is superior laryngeal nerve?
The superior laryngeal nerve, a branch of the vagus nerve, innervates the cricothyroid muscle of the larynx. This muscle stretches, tenses, and adducts the vocal cord. Superior laryngeal neuralgia usually appears as a postsurgical complication.
What nerves innervate laryngeal muscles?
The laryngeal muscles receive innervation from two nerves, the external branch of the superior laryngeal nerve and the recurrent laryngeal nerve.
How do you test for laryngeal nerve damage?
The health care provider will check to see how your vocal cords move. Abnormal movement may mean that a laryngeal nerve is injured….Tests may include:
- Bronchoscopy.
- CT scan of the chest.
- Laryngoscopy.
- MRI of the brain, neck, and chest.
- X-ray.
What is external laryngeal nerve?
The external laryngeal nerve is a mixed nerve and the smaller of the two. It descends with the superior thyroid artery to supply the cricothyroid muscle, the inferior constrictor muscle and the neighboring laryngeal mucosa.