Larynx III - Intrinsic Muscles, Innervation & Cord Movement

Question 1

what are the principle actions associated with the RLN (Recurrent Laryngeal Nerves)?

Answer 1

aDduction of vocal cords

aBduction of vocal cords

shortening vocal cords

Serve all the intrinisic muscles EXCEPT the Cricothyroid muscles

Question 2

What is the principle actions associated with the the Superior Laryngeal Nerves (SLN)?

Answer 2

tensing the vocal cords

ONLY serves 1 set of muscles — the Cricothyroid muscles

Question 3

what cranial nerve supplies the RLN and SLN

Answer 3

CN X (vagus)

Question 4

All of the Intrinsic Laryngeal muscles are paired EXCEPT _________

A) Oblique Arytenoid

B) Cricothyroid

C) Vocalis

D) Transverse Arytenoid

Answer 4

D) Transverse Arytenoid

is a single muscle

Question 5

Which 3 intrinsic laryngeal muscles work as aDductors

Answer 5

1. lateral cricoarytenoid
2. oblique arytenoid
3. transverse arytenoid

Question 6

Which two intrinsic laryngeal muscles are responsible for shortening the vocal cords ?

Answer 6

1. thyroarytenoid
2. vocalis

Question 7

Which intrinsic laryngeal muscles aBduct the vocal cords?

Answer 7

Posterior cricoarytenoid

Question 8

Which intrinsic laryngeal muscle tense the vocal cords?

Answer 8

criocothyoid

Question 9

Which intrinsic laryngeal muscles close the glottis?

Answer 9

1. aryepiglottic
2. thyroepiglottic

Question 10

Identify the numbered structures

Answer 10

1. aryepiglottic m. (oblique arytenoid to latteral epiglottis)
2. oblique and transervse arytenoid m.m.
3. posterior crico-arytenoid m.
4. crico-thyroid m. (cut)
5. thyro-epiglottic m.
6. thyro-arytenoid m.
7. lateral crico-arytenoid m.

Question 11

Identify the numbered structures

Answer 11

1. cuneiform tubercle
2. corniculate tubercle
3. aryepglottic m.
4. oblique arytenoid m.
5. thransverse arytenoid m.
6. posterior crico-arytenoid m.
7. cricoid cartilage

Question 12

What muscle and what action performed ?

Answer 12

posterior cricoarytenoid

aBduct

Question 13

What muscles and what actions ?

Answer 13

Lateral cricoarytenoid m.m.

aDduct

Question 14

what muscle and what action

Answer 14

transverse arytenoid

aDduct

Question 15

What structures provide a spring like action that helps reopen the vocal cords?

Answer 15

cuneiform and corniculate cartilages

Question 16

Identify the number structures

Answer 16

1. cricothyroid m.
2. thyroarytenoid m.
3. vocalis m.
4. vocal ligaments

Question 17

What causes the scalloped wavey look of the vocal ligaments?

Answer 17

when the vocalis and thyroarytenoids contract

Question 18

Identify numbered structures and actions

Answer 18

1. oblique belly of cricothyroid m.
2. vertical belly of cricothyroid m.

work to lift up and backwards the cricoid cartilage to tense the vocal cords

Question 19

Which muscle works to oppose the aDduct action of the lateral cricoarytenoid, oblique arytenoid, and transverse arytenoid m.m.?

Answer 19

Posterior cricoarytenoid m.m. to aBduct

Question 20

which muslce works to oppose the vocal cord shortening actions of the vocalis and thyroarytenoid m.m.?

Answer 20

the cricothyroid m. tenses the vocal cords

Question 21

Which nerve wraps around the subclavian artery?

Answer 21

Right RLN

Remember:

the Right RNL Raps Round the Right subclavian artery

Question 22

which nerve wraps around the aortic arch?

Answer 22

Left RLN

Question 23

Which branch of the SNL pierces the thyrohyoid membrane?

Answer 23

the internal branch

provides Sensory to supraglotic region

Question 24

which branch of the SLN provides motor fibers to the cricothyroid muscles?

Answer 24

External branch

Question 25

Which nerve provides motor fibers to the cricothyroid and sensory fibers to the supraglottic (vocal cords and up) region?

Answer 25

SLN

Question 26

Which nerve provides motor fibers to all intrinsic laryngeal m.m. (except cricothyroids) and sensory to the infraglottic (vocal cords and down)?

Answer 26

RLN