Muscles of the larynx

Question 1

Origin of m. sternothyroideus

Answer 1

First costal cartilage

Question 2

Insertion of m. sternothyroideus

Answer 2

Lamina of the thyroid cartilage

Question 3

Function of m. sternothyroideus

Answer 3

Retraction of the larynx, hyoid apparatus and tongue

Question 4

Origin of m. cricoarytenoideus dorsalis

Answer 4

Dorso-laterally on the cricoid cartilage lamina

Question 5

Insertion of m. cricoarytenoideus dorsalis

Answer 5

Muscular process of the arytenoid cartilage

Question 6

Function of m. cricoarytenoideus dorsalis

Answer 6

Opens the rima glottides (laryngeal entrance). Swings the vocal process laterally by drawing the arytenoid cartilage caudo-medially; it is the only abductor of the vocal cords!

Question 7

Origin of m. cricothyroideus

Answer 7

Lateral surface of the cricoid cartilage

Question 8

Insertion of m. cricothyroideus

Answer 8

Caudal and medial surface of the thyroid lamina

Question 9

Function of m. cricothyroideus

Answer 9

Rotates the cricoid cartilage about the cricothyroid articulation, which makes the dorsal part of the cricoid (and therefore the arytenoids) to move caudally. This tenses the vocal cords

Question 10

Origin of m. vocalis

Answer 10

The floor of the “U” formed by the thyroid cartilage

Question 11

Insertion of m. vocalis

Answer 11

Vocal process of the arytenoid cartilage

Question 12

Function of m. vocalis

Answer 12

Relaxation of the vocal cord by drawing the arytenoid cartilage ventrally