Muscles of the larynx Flashcards Preview

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Flashcards in Muscles of the larynx Deck (35)
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1

Where are most of the intrinsic muscles of the larynx located?

Within the larynx
deep to the thyroid cartilage

2

What are the actions of the intrinsic muscles of the larynx?

Move the aretynoid cartilage on cricoid cartilage at the cricoaretynoid joint
moves the true vocal cords
changes the diameter of the rima glottidis

3

What is the innervations of most of the intrinsic muscles of the larynx?

Recurrent laryngeal nerve

4

What does the recurrent laryngeal nerve branch off?

CN10 vagus nerve

5

How does the recurrent laryngeal nerve ascend up the neck?

In the tracheo-oesophageal groove

6

What is a close anatomical relation of the recurrent laryngeal nerve?

Inferior thyroid artery

Aortic arch

Apex of lung

7

What does the recurrent laryngeal nerve innervate apart from the intrinsic muscles of the larynx?

Sensory innervation to infraglottis

8

What are two important intrinsic laryngeal muscles?

Posterior cricoaretynoid muscle

Cricothyroid muscle

9

What does the posterior cricoaretynoid muscle attach to?

Cricoid cartilage posteriorly

Aretynoid cartilage

10

What is the innervation of the posterior cricoaretynoid muscle?

Recurrent laryngeal nerve

11

What is the action of the posterior cricoaretynoid muscle?

Abducts vocal cords

12

What is special about the posterior cricoaretynoid muscle?

Only intrinsic muscle of the larynx that abducts the vocal cords

13

What does the cricothyroid muscle attach to?

Cricoid cartilage anteriorly

Thyroid cartilage anteriorly

14

What is the innervation of the cricothyroid muscle?

Superior laryngeal nerve
external branch

15

What is the action of the cricothyroid muscle?

Bilateral contraction
tilts the thyroid cartilage anteriorly over the cricoid cartilage
increases tension of vocal cords
higher pitched sound

16

What is special about the cricothyroid muscle?

Only intrinsic muscle of larynx to be found outside of larynx

Only intrinsic muscle of larynx not innervated by the recurrent laryngeal nerve

17

How does tension and length of true vocal cords affect pitch of vocal sounds?

Increased tension and length gives high pithced vocal sounds

Decreased tension and length gives low-pitched vocal sounds

18

What does the superior laryngeal nerve branch off?

CN10 vagus nerve

19

What are the branches of the superior laryngeal nerve itself?

External branch

Internal branch

20

What is a close anatomical relation of the external branch of the superior laryngeal nerve?

Superior thyroid artery

21

What does the internal brach of the superior laryngeal nerve innervate?

Sensory innervation to supraglottis

22

What happens to the vocal cords during inspiration and expiration?

Abduct

23

What happens to the rima glottidis when the vocal cords abduct?

Increased diameter

24

What does the level of abduction of the true vocal cords during inspiration and expiration depend on?

How deep the breathing is
more abduction if deeper breathing

25

What happens to the vocal cords during phonation?

Adduct

26

What happens to the rima glottidis when the vocal cords adduct?

Decreased diameter

27

Why are the vocal cords adducted during phonation?

Expired air forced through closely adducted vocal cords
vocal cords vibrate
gives pitch of voice

28

What happens to the epiglottis when swallowing?

Aryepiglottic muscles contract
pull down epiglottis over the laryngeal inlet

29

Why does the epiglottis cover the laryngeal inlet when swallowing?

To prevent aspiration

30

What happens to the larynx itself during swallowing?

Pharyngeal muscles and suprahyoid muscles contract
pull larynx upwards and forwards