Larynx

Question 1

Origin and insertion of cricothyroid

Answer 1

Origin: anterior and lateral asects of arch of cricoid cartilage

Insertion: inferior margin and inferior horn of thyroid cartilage

Question 2

Innervation of cricothyroid

Answer 2

external branch of superior laryngeal nerve

Question 3

action of cricothyroid

Answer 3

stretches vocal fold

increases pitch of the voice

Question 4

Origin and insertion of posterior cricoarytenoid

Answer 4

origin: posteiror surface of lamina of cricoid cartilage
insertion: muscular process of arytenoid cartilage

Question 5

Innervation of posterior cricoarytenoid

Answer 5

inferior laryngeal nerve

Question 6

action of posterior cricoarytenoid

Answer 6

abducts vocal fold

opens airway more to faciliate breathing

Question 7

Origin and insertion of lateral cricoarytenoid

Answer 7

origin: superior border of arch of cricoid cartilage
insertion: muscular process of arytenoid cartilage

Question 8

innervation of lateral cricoarytenoid

Answer 8

inferior laryngeal nerve

Question 9

action of lateral cricoarytenoid

Answer 9

adducts vocal fold

closes airway partially or completely depending upon the action of other muscles

Question 10

origin and insertion of thyroarytenoid

Answer 10

origin: posteiror surface of thyroid cartilage at midline angle
insertion: anterolateral border and vocal process of arytenoid cartilage

Question 11

innervation of thyroarytenoid

Answer 11

inferior laryngeal nerve

Question 12

action of thyroarytenoid

Answer 12

relaxes vocal fold

lowers pitch of the voice

Question 13

Origin and insertion of transverse and oblique arytenoid

Answer 13

Origin: one arytenoid cartilage

Insertion: opposite arytenoid caritlage

Question 14

Innervation of the transverse and oblique arytenoid

Answer 14

inferior laryngeal nerve

Question 15

action of the transvers and oblique arytenoid

Answer 15

closes intercarilaginous portion of rima glottidis

important for coughing

Question 16

origin and insertion of vocalis

Answer 16

origin: vocal process of arytenoid cartilage
insertion: vocal ligaments

Question 17

innervation of vocalis

Answer 17

inferior laryngeal nerve

Question 18

action of vocalis

Answer 18

fine tunes tension of vocal ligament

affects the pitch of the voice

Question 19

What provides GSA innervation and what structures are present in the INLET?

Answer 19

GSA: CN X via internal branch of superior laryngeal nerve

Structures: mucosa over epiglottis, aryepiglottic fold, mucosa of interarytenoid notch

Question 20

What provides GSA innervation and what structures are present in the VESTIBULE?

Answer 20

GSA: CN X via internal branch of superior laryngeal nerve

Structures: mucosa over quadrangular membrane, vestibular fold

Question 21

What provides GSA innervation and what structures are present in the VENTRICLE/SACCULE?

Answer 21

GSA: CN X via internal branch of superior laryngeal nerve

Structures: mucosa lining ventricle, sacculus

Question 22

What provides GSA innervation and what structures are present in the INFRAGLOTTIC SPACE?

Answer 22

GSA: CN X via inferior laryngeal nerve

Structures: mucos over conus elasticus (below true vocal folds)