Is superior laryngeal nerve a branch of vagus?

The superior laryngeal branch of the vagus nerve originates from the 4th pharyngeal arch along with the cricothyroid muscle. This developmental pattern elucidates why the cricothyroid muscle is the only muscle that receives innervation via the superior laryngeal nerve.

Which branch of the vagus nerve pierce the Thyrohyoid membrane?

superior laryngeal nerve
The superior laryngeal nerve has two branches: the internal laryngeal nerve pierces the thyrohyoid membrane and is sensory to the mucosa of pharynx and larynx from the level of epiglottis to vocal folds; the external laryngeal nerve is motor to cricothyroid. Fig. 6.8. Distribution of the right vagus nerve.

What does the recurrent laryngeal branch of the vagus nerve innervate?

The recurrent laryngeal nerve (RLN) is a branch of the vagus nerve (cranial nerve X) that supplies all the intrinsic muscles of the larynx, with the exception of the cricothyroid muscles.

What does the pharyngeal branch of the vagus nerve do?

Motor Functions The vagus nerve innervates the majority of the muscles associated with the pharynx and larynx. These muscles are responsible for the initiation of swallowing and phonation.

Is the superior laryngeal nerve a vagus nerve branch?

The superior laryngeal nerve is a branch of the vagus nerve. It arises from the middle of the inferior ganglion of vagus nerve and in its course receives a branch from the superior cervical ganglion of the sympathetic nervous system. The cricothyroid muscles are innervated by the superior laryngeal nerve.

Where does the external branch of the vagus nerve travel?

The external laryngeal branch travels to the inferior pharyngeal constrictor muscle.This branch innervates an intrinsic laryngeal muscle called the cricothyroid muscle. All other intrinsic laryngeal muscles are innervated by the recurrent laryngeal nerve, which is another branch of the vagus nerve, discussed below.

Where does sensory innervation of the larynx come from?

Above the vocal folds the sensory innervation of the larynx is via the internal laryngeal nerve. Below the vocal folds it is by way of branches of the recurrent laryngeal nerve. The vocal fold itself receives dual innervation from both nerves.

Which is branch of vagus nerve innervates cricothyroid muscle?

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. There are paroxysms of unilateral submandibular pain, sometimes radiating to the eye, ear, or shoulder.