Anatomy of the larynx Flashcards Preview

Board Review CRNA (Sweat Book) > Anatomy of the larynx > Flashcards

Flashcards in Anatomy of the larynx Deck (17):
1

Because it supplies all other intrinsic muscles of the larynx except the ________, the ______ nerve is the major motor nerve of the larynx.

cricothyroid; recurrent laryngeal nerve

2

The ______ branch of the _______ nerve innervates the cricothyroid muscle.

external branch of the superior laryngeal nerve

"ME IS"

3

The ______ branch of the _______ is the primary sensory nerve of the larynx.

internal branch of the superior laryngeal nerve

4

The ________ nerve supplies laryngeal tissue from the vocal cords up, including the vocal cords..... The ______ nerve supplies the sensory innervation to laryngeal mucosa inferior to the vocal cords.

internal branch of the SLN; RLN

5

Name the function of the following laryngeal muscle: posterior cricoarytenoids

ABDUCT vocal cords ("dilates" cords)

6

Name the function of the following laryngeal muscle:
lateral cricoarytenoids

ADDUCT vocal cords

7

Name the function of the following laryngeal muscle:
transverse arytenoid

close rima glottidis

8

Name the function of the following laryngeal muscle:
oblique arytenoid

controls sphincters to vestibule; decreases volume of the larynx (narrows the inlet)

9

Name the function of the following laryngeal muscle:
aryepiglottics (continuations of the oblique arytenoids)

controls sphincters to vestibule (narrows the inlet)

10

Name the function of the following laryngeal muscle:
thyroepiglottics (continuations of the thyroarytenoids)

controls sphincters to vestibule (widens the inlet)

11

Name the function of the following laryngeal muscle:
cricothyroids

increase vocal cord tension (tenses the cords)

12

Name the function of the following laryngeal muscle:
thyroarytenoids

reduce cord tension (relax the cords)

13

Cricoarytenoids (whether posterior or lateral)... ________ the cords. Cricothyroids and thyroarytenoids ______ and ____ the cords, respectively.

posterior cricoarytenoids "pull from behind" and abduct
lateral cricoarytenoids "push from the side" to adduct
cricothyroids TENSE (tension)
thyroarytenoids RELAX (tension)

14

What happens when there is damage to the external branch of the superior laryngeal nerve?

well... external SLN is MOTOR to the cricothyroid ONLY... so the cricothyroid muscle is paralyzed--> the cricothyroid muscle normally tenses the cords... so the cords cannot be tensed--> weakness and huskiness of the voice

15

If one cord is flaccid and in an intermediate position after a subtotal thyroidectomy, there is ______ RLN paralysis and ______ results.

unilateral; hoarseness

16

If both cords are flaccid and each assumes an intermediate position after subtotal thyroidectomy, there is _______ RLN paralysis and _______ and ________ results.

bilateral; aphonia (lost speech); airway obstruction

17

_______ after thyroidectomy may result from either hypocalcemia (tensed cords d\t tetany) or bilateral RLN damage.

stridor