Muscles of the Larynx

Question 1

Name the 5 major muscles of the larynx

Answer 1

1. Cricothyroid
2. Thyroarytenoid
3. Posterior cricoarytenoid
4. Lateral cricoarytenoid
5. Transverse arytenoids

Question 2

What is the origin of the cricothyroid muscle?

Answer 2

Anterolateral part of cricoid cartilage

Question 3

What is the insertion of the cricothyroid muscle?

Answer 3

Inferior part of thyroid cartilage

Question 4

What is the innervation of the cricothyroid muscle?

Answer 4

Vagus through external laryngeal nerve

Question 5

What is the main action of the cricothyroid muscle?

Answer 5

Tenses vocal ligaments

Question 6

What are the 2 origins of the thyroarytenoid muscle?

Answer 6

1. Inner surface of thyroid cartilage

2. Cricothyroid ligament

Question 7

What is the insertion of the thyroarytenoid muscle?

Answer 7

Anterolateral surface of arytenoid

Question 8

What is the innervation of the thyroarytenoid muscle?

Answer 8

Recurrent laryngeal nerve

Question 9

What is the main action of the thyroarytenoid muscle?

Answer 9

Relax vocal ligaments

Question 10

What is the origin of the posterior cricoarytenoid muscle?

Answer 10

Posterior surface of cricoid cartilage

Question 11

What is the insertion of the posterior cricoarytenoid muscle?

Answer 11

Muscular process of arytenoid cartilage

Question 12

What is the innervation of the posterior cricoarytenoid muscle?

Answer 12

Recurrent laryngeal nerve

Question 13

What is the main action of the posterior cricoarytenoid muscle?

Answer 13

Abduct the vocal ligaments

Question 14

What is the origin of the lateral cricoarytenoid muscle?

Answer 14

Arch of cricoid cartilage

Question 15

What is the insertion of the lateral cricoarytenoid muscle?

Answer 15

Muscular process of arytenoid cartilage

Question 16

What is the innervation of the lateral cricoarytenoid muscle?

Answer 16

Recurrent laryngeal nerve

Question 17

What is the main action of the lateral cricoarytenoid muscle?

Answer 17

Adduct vocal ligaments

Question 18

What is the origin of the transverse arytenoids?

Answer 18

One arytenoid cartilage

Question 19

What is the insertion of the transverse arytenoids?

Answer 19

Contralateral arytenoid cartilage

Question 20

What is the innervation of the transverse arytenoids?

Answer 20

Recurrent laryngeal nerve

Question 21

What is the main action of the transverse arytenoids?

Answer 21

Adduct posterior part of rima glottidis

Question 22

Name 3 muscles responsible for narrowing the laryngeal inlet

Answer 22

1. Oblique arytenoid
2. Aryepiglottic muscle
3. Thryroepiglottic muscle

Question 23

Name the muscle responsible for increasing length and tension of vocal ligaments

Answer 23

Cricothyroid

Question 24

Explain how the vocal ligaments are lengthened and tensed

Answer 24

Cricothyroid increases distance between angle of thyroid cartilage and vocal process of arytenoid cartilages

Question 25

Name the muscle responsible for decreasing length and tension of vocal ligaments

Answer 25

Thyroarytenoid

Question 26

Explain how the length and tension in vocal ligaments is decreased

Answer 26

Thyroarytenoid pulls arytenoid cartilage forward toward the thyroid cartilage

Question 27

What occurs if the posterior cricoarytenoid is paralysed?

Answer 27

Asphyxia

Question 28

What are the 2 divisions of the superior laryngeal nerve?

Answer 28

1. External laryngeal nerve | 2. Internal laryngeal nerve

Question 29

Where does the external laryngeal nerve supply?

Answer 29

Cricothyroid muscle

Question 30

Where does the sensory part of the internal laryngeal nerve supply?

Answer 30

Laryngeal cavity to the level of the vocal ligaments

Question 31

Where does the sensory part of the recurrent laryngeal nerve supply?

Answer 31

Laryngeal cavity below the level of the vocal ligaments

Question 32

Where does the motor part of the recurrent laryngeal nerve supply?

Answer 32

All intrinsic muscles of larynx except cricothyroid

Question 33

What is the lymphatic drainage of the larynx above the level of the vocal ligaments?

Answer 33

Superior deep cervical lymph nodes

Question 34

What is the lymphatic drainage of the larynx below the level of the vocal ligaments?

Answer 34

Inferior deep cervical lymph nodes