Intrinsic Muscles of the Larynx

Question 1

Cricothyroid

Answer 1

lateral surface of cricoid cartilage

lower fibers: anterior margin of inferior horn of thyroid cartilage; upper fibers: lower border of the lamina of the
thyroid cartilage

flexes thyroid on cricoid cartilage to tense vocal cords

External Laryngeal N. (from Superior Laryngeal branch of X)

Question 2

Posterior Cricoarytenoid

Answer 2

posterior surface of cricoid cartilage

muscular process of arytenoid cartilage

abducts vocal folds

Recurrent (Inferior) Laryngeal N. (from X)

Question 3

Lateral Cricoarytenoid

Answer 3

upper margin of arch of cricoid cartilage

anterior portion of muscular process of arytenoid cartilage

adducts vocal folds

Recurrent Laryngeal N.

Question 4

Transverse Arytenoid

Answer 4

crosses transversely between the two arytenoid cartilages

adducts vocal folds

Recurrent Laryngeal N.

Question 5

Oblique Arytenoid

Answer 5

each cross from the base of one arytenoid cartilage to the apex of the other

constricts/ closes laryngeal inlet

Recurrent Laryngeal N.

Question 6

Aryepiglottic Muscle

Answer 6

tip of epiglottis

tip of ipsilateral arytenoid cartilage, blending with oblique arytenoid fibers of same side

together with oblique arytenoids, constricts/closes laryngeal inlet

Recurrent Laryngeal N.

Question 7

Thyroarytenoideus

Answer 7

lower half of medial part of thyroid lamina

lateral part of arytenoid cartilage

adducts vocal folds & slackens vocal cords

Recurrent Laryngeal N.

Question 8

Thyroarytenoideus

Vocalis

Answer 8

medial thyroid lamina and cricothyroid ligament

vocal process and anterior part of arytenoid cartilage

alters tension on vocal folds

Recurrent Laryngeal N.

Question 9

Thyroepiglotticus

Answer 9

lower medial surface of thyroid lamina

lateral margin of epiglottis and aryepiglottic fold

narrows rima glottidis

Recurrent Laryngeal N.