larynx muscles

Question 1

cricothyroid

Answer 1

origin: anterolateral aspect of arch of cricoid cartilage

insertion: oblique part: inferior horn of thyroid cartilage
straight part: inferior margin of thyroid cartilage

action: stretches and tenses vocal ligament

Question 2

lateral crico-arytenoid

Answer 2

origin: Superior surface of arch of cricoid cartilage
insertion: Anterior surface of muscular process of arytenoid cartilage
action: Adducts vocal folds

Question 3

posterior cricoarytenoid

Answer 3

origin: Posterior surface of lamina of cricoid cartilage
insertion: Posterior surface of muscular process of arytenoid cartilage
action: Abducts vocal folds

Question 4

transverse arytenoid

Answer 4

origin: Lateral border of posterior surface of arytenoid cartilage
insertion: Lateral border of posterior surface of opposite arytenoid cartilage
action: Adduct arytenoid cartilages (adducting intercartilaginous portion of vocal folds, closing posterior rima glottidis)

Question 5

oblique arytenoid

Answer 5

origin: Posterior surface of muscular process of arytenoid cartilage
insertion: Posterior surface of apex of adjacent arytenoid cartilage; extends into ary-epiglottic fold
action: Adduct arytenoid cartilages (adducting intercartilaginous portion of vocal folds, closing posterior rima glottidis)

Question 6

thyroarytenoid

Answer 6

origin: Lower half of posterior aspect of angle of thyroid laminae and cricothyroid ligament
insertion: Anterolateral surface of arytenoid cartilage
action: Relaxes vocal ligament

Question 7

vocalis

Answer 7

origin: Lateral surface of vocal process of arytenoid cartilage
insertion: Ipsilateral vocal ligament
action: Relaxes posterior vocal ligament while maintaining tension of the anterior part

Question 8

what is the innervation of the larynx muscles?

Answer 8

all innervated by inferior laryngeal nerve which is a branch of the recurrent laryngeal of vagus nerve.
except cricoarytenoid which is innervated by the external branch of the superior laryngeal nerve