Anatomy and Physiology

Question 1

Where is the origin and insertion of the intrinsic muscles?

Answer 1

Within the larynx

Question 2

How many intrinsic muscles are there?

Answer 2

6

Question 3

Which intrinsic muscle is not paired?

Answer 3

Transverse Arytenoids Muscle (TA)

Question 4

What type of muscle do the intrinsic muscles consist of?

Answer 4

Striated muscle (involuntary control)

Question 5

Posterior Cricoarytenoid Muscle (PCA)

Answer 5

• ONLY abductor muscle of the larynx (opens the airway by moving the vocal folds laterally or away from the midline).
• LARGEST muscle of the larynx.

Question 6

Is the Posterior Cricoarytenoid Muscle (PCA) paired or unpaired?

Answer 6

Paired

Question 7

Origin of the Posterior Cricoarytenoid Muscle (PCA)

Answer 7

Posterior aspect of the cricoid cartilage

Question 8

Insertion of the Posterior Cricoarytenoid Muscle (PCA)

Answer 8

Muscular process of the arytenoid cartilages

Question 9

Vagus branch of the Posterior Cricoarytenoid Muscle (PCA)

Answer 9

RLN

Question 10

Lateral Cricoarytenoid Muscle (LCA)

Answer 10

• PRIMARY adductor muscle of the larynx (close the airway by moving the vocal folds medially, or toward the midline)
• Antagonist to the Posterior Cricoarytenoid Muscle

Question 11

Is the Lateral Cricoarytenoid Muscle (LCA) paired or unpaired?

Answer 11

Paired

Question 12

Origin of the Lateral Cricoarytenoid Muscle (LCA)

Answer 12

Upper boarder of the cricoid cartilage

Question 13

Insertion of the Lateral Cricoarytenoid Muscle (LCA)

Answer 13

Muscular process of the arytenoid cartilage

Question 14

Vagus branch of the Lateral Cricoarytenoid Muscle (LCA)

Answer 14

RLN

Question 15

Transverse Arytenoid Muscle (TA)

Answer 15

• Approximates the bodies of the arytenoid cartilage (which adducts the base of the arytenoid cartilage - does not go to the tips of the arytenoids)
• Serves to compress the Vocal Folds

Question 16

Is the Transverse Arytenoid Muscle (TA) paired or unpaired?

Answer 16

UNPAIRED only unpaired intrinsic muscle

Question 17

Origin of the Transverse Arytenoid Muscle (TA)

Answer 17

Lateral margin of ONE arytenoid cartilage

Question 18

Insertion of the Transverse Arytenoid Muscle (TA)

Answer 18

Lateral margin of OPPOSITE arytenoid cartilage

Question 19

Vagus branch of the Transverse Arytenoid Muscle (TA)

Answer 19

RLN

Question 20

Oblique Arytenoid Muscle (OA)

Answer 20

• Primarily responsible for adducting the tip (apex) of the arytenoid
• The muscle fibers continue superiorly to the lateral border of the epiglottis
• It becomes known as the aryepiglottis muscle when it leaves the tip of the arytenoid, which forms the aryepiglottic folds

Question 21

Is the Oblique Arytenoid Muscle (OA) paired or unpaired?

Answer 21

Paired

Question 22

Origin of the Oblique Arytenoid Muscle (OA)

Answer 22

Muscular process of ONE arytenoid cartilage

Question 23

Insertion of the Oblique Arytenoid Muscle (OA)

Answer 23

Apex (tip) of the opposing arytenoid process

Question 24

Vagus branch of the Oblique Arytenoid Muscle (OA)

Answer 24

RLN