Arytenoid muscle

The arytenoid muscle or interarytenoid muscle is a composite intrinsic muscle of the larynx, consisting of a transverse part and an oblique part - the two parts may be considered as separate muscles: an unpaired transverse arytenoid muscle, and a bilaterally paired oblique arytenoid muscle.

The two constituent parts differ in their attachments, structure and actions. Both receive motor innervation from the recurrent laryngeal nerve(s) (each nerve being a branch of one vagus nerve (CN X)).

Electromyography
Function of the arytenoid muscle is a good method to determine function of the recurrent laryngeal nerve. Continuous electromyography of the arytenoid muscle can provide confidence to surgeons that the recurrent laryngeal nerve is not damaged during neck surgeries, such as thyroidectomy.

Other animals
The arytenoid muscle is found in many animals, including dogs.