orign:  arch of cricoid cartilage

insertion:  inferior horn and lower lamina of thyroid cartilage

external laryngeal

tenses; adducts; elongates vocal cords

origin:  posterior surface of lamina of cricoid cartilage

insertion:  arytenoid cartilage

recurrent laryngeal n.

abducts vocal cords

rotates arytenoid cartilage laterally

origin:  arch of cricoid cartilage

insertion:  arytenoid cartilage

recurrent laryngeal n.

adducts vocal cords

rotates arytenoid cartilage medially

origin:  posterior surface of arytenoid cartilage

insertion:  opposite arytenoid cartilage

recurrent laryngeal n.

adducts vocal cords

(whispering muscle)

origin:  apex of arytenoid cartilage

insertion:  side of epiglottic cartilage

recurrent laryngeal n.

adducts vocal cords

origin:  inner surface ofthyroid lamina

insertion:  anterolateral surface of arytenoid cartilage

recurrent laryngeal n.

adducts and relaxes vocal cords

origin:  anteromedial surface of lamina of thyroid cartilage

insertion:  lateral margin of epiglottic cartilage

recurrent laryngeal n.

adducts vocal cords

origin:  angle b/t 2 laminae of thyroid cartilage

insertion:  vocal process of arytenoid cartilage

recurrent laryngeal n.

adducts vocal cords

anterior part tenses vocal cords

posterior part relaxes vocal cords

controls pitch