| Arytenoid muscle | |
| Latin: | musculus arytaenoideus |
| Origin: | Arytenoid cartilage on one side |
| Insertion: | Arytenoid cartilage on opposite side |
| Blood: | Superior laryngeal artery |
| Nerve: | Recurrent laryngeal branch of the vagus |
| Action: | Approximate the arytenoid cartilages (close rima glottis) |
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.[1]
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)).
Function of the arytenoid muscle is a good method to determine function of the recurrent laryngeal nerve.[2] 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.
The arytenoid muscle is found in many animals, including dogs.[3]