Laryngeal Muscles

Question 1

Laryngeal Muscles + Larynx

Answer 1

ALL will have some effect on the larynx

Question 2

2 classes of Laryngeal Muscles

Answer 2

1) Extrinsic Laryngeal Muscles
2) Intrinsic Laryngeal Muscles

Question 3

Extrinsic Laryngeal Muscles

Answer 3

One attachment on a laryngeal cartilage and one attachment OUTSIDE of the larynx

Question 4

Intrinsic Laryngeal Muscles

Answer 4

Contained WITHIN the larynx

BOTH origin AND insertion are on LARYNGEAL CARTILAGES

Question 5

Extrinsic Laryngeal Muscle FUNCTION

Answer 5

Will elevate (raise) the larynx or depress (lower) the larynx

Will move the larynx as a whole

Work as a group + they all share the same function

REMEMBER:

Elevate = raise = to move upward
Depress = lower = to move downward

Question 6

Intrinsic Laryngeal Muscle FUNCTION

Answer 6

Act on the vocal folds by:

OPENING/CLOSING

TENSING/RELAXING

Have an effect on the vocal folds + the SHAPE of the glottis

Question 7

2 Classes of EXTRINSIC laryngeal muscles

Answer 7

1) Suprahyoid (Laryngeal Elevators)
2) Infrahyoid (Laryngeal Depressors)

Question 8

Suprahyoid (Laryngeal Elevators)

Answer 8

Supra means “above” or “over”

Suprahyoid muscles are attached to the Hyoid Bone AND to a structure that is located ABOVE they hyoid bone

As a group, they will ELEVATE or RAISE the larynx

Question 9

Infrahyoid (Laryngeal Depressors)

Answer 9

Infra means “below”

Infrahyoid Muscles are attached to the Larynx AND to a structure that is located BELOW the Hyoid Bone

As a group, they will DEPRESS or LOWER the larynx

Question 10

4 Suprahyoid Muscles (extrinsic)

Answer 10

Dan Sold My Goat

1) Digastric: Anterior + Posterior Bellies

2) Stylohyoid

3) Mylohyoid

4) Geniohyoid

Question 11

4 INFRAhyoid Muscles (extrinsic)

Answer 11

SOS - T (sung to that Rihanna song “sos please someonehelp me”)
1) Sternohyoid

2) Omohyoid: Anterior and Posterior bellies

3) Sternothyroid

4) Thyrohyoid

Question 12

INTRINSIC laryngeal Muscles (5)

Answer 12

1. Thyroarytenoid: tense, relax, adduct (2 parts)

2.Cricothyroid - Primary regulator of tense (pitch)

3. Posterior Cricoarytenoid (PCA) - abduction
4. Lateral Cricoarytenoid (LCA) - adduction
5. Interarytenoids (IA) - adduct by sliding the arytenoids (2 parts)

Question 13

Thyroarytenoid muscle (2 parts) (intrinsic)

Answer 13

TENSE, RELAX, ADDUCT

a. thyrovocalis

main mass of the vocal folds
assists in TENSING the vocal folds

b. thyromuscularis

RELAXES

THYROVOCALIS + THYROMUSCULARIS: assist in ADDUCTION

Question 14

Cricothyroid muscles (intrinsic)

Answer 14

Primary regulator of tense (pitch)

2 parts:

A. PARS OBLIQUE (Lateral) (Angled)
B. PARS RECTA (Anterior) (Straight)

Question 15

Posterior Cricoarytenoid (PCA) (intrinsic)

Answer 15

Aids in abduction

Question 16

Lateral Cricoarytenoid (LCA)(intrinsic)

Answer 16

Aids in adduction

Question 17

Interarytenoids (IA) (Intrinsic)

Answer 17

Adduct by sliding the arytenoids

2 parts:

A. OBLIQUE INTERARYTENOID
B. TRANSVERSE INTERARYTENOID

Question 18

Intrinsic Laryngeal Muscles (Adduction)

Answer 18

Lateral Cricoarytenoid

Interarytenoids
-Oblique + transverse

Thyroarytenoid (assists ONLY)

Question 19

Intrinsic Laryngeal Muscles (Abduction)

Answer 19

Posterior Cricoarytenoid

Question 20

Intrinsic Laryneal Muscles (Tensing)

Answer 20

Cricothyroid
-pars oblique(lateral) + pars recta (anterior)

Thyroarytenoid
-thyrovocalis

Question 21

Intrinsic Laryngeal Muscles (relaxing)

Answer 21

thyroarytenoid - thyromuscularis