Extrinsic Laryngeal Muscules

Question 1

Origin: inner surface of the mandible (anterior) and mastoid process of temporal bone (posterior)
Insertion: the hyoid bone by means of the intermediate tendon
Function: simultaneous contracts lifts the larynx
Innervation: anterior belly = CN V (trigeminal), posterior belly = CN VII (digastric branch of the facial nerve)

Answer 1

Digastric: anterior and posterior

Question 2

What section of the digastric laryngeal muscle pulls the hyoid bone anteriorly and superiorly?

Answer 2

Anterior digastric muscle

Question 3

What section of the digastric laryngeal muscle pulls the hyoid bone posteriorly and superiorly?

Answer 3

Posterior digastric muscle

Question 4

Origin: lateral aspects of the inner mandible
Insertion: body of hyoid bone
Function: move hyoid bone anteriorly and superiorly
Innervation: CN V Trigeminal nerve

Answer 4

Mylohyoid

Question 5

What muscle forms the floor of the mouth?

Answer 5

Mylohyoid

Question 6

Mylo means?

Answer 6

Molar

Question 7

What muscle elevates the floor of the mouth in the first phase of swallowing?

Answer 7

Mylohyoid muscle

Question 8

What muscle lies on the superior surface of the mylohyoid muscle?

Answer 8

Geniohyoid muscle

Question 9

Origin: inner medial surface of the mandible/chin
Insertion: anterior surface of the hyoid corpus
Function: pulls the hyoid bone anteriorly and superiorly
Innervation: CN XII - hypoglossal

Answer 9

Geniohyoid

Question 10

What are the suprahyoid extrinsic laryngeal muscles?

Answer 10

1. Digastric
2. Geniohyoid
3. Mylohyoid
4. Stylohyoid

Question 11

What are the infrahyoid extrinsic laryngeal muscles?

Answer 11

1. Sternohyoid
2. Omohyoid
3. Sternothyroid
4. Thyrohyoid

Question 12

What suprahyoid extrinsic laryngeal muscle is unpaired?

Answer 12

Mylohyoid

Question 13

Origin: styloid process of the temporal bone
Insertion: body of the hyoid
Function: pulls the hyoid and larynx upward and backward
Innervation: CN VII - facial nerve

Answer 13

Stylohyoid

Question 14

What suprahyoid ELMS is a long slender muscle?

Answer 14

Stylohyoid

Question 15

Origin: Sternum (manubrium)
Insertion: inferior margin of hte hyoid body
Function: depress the hyoid bone
Innervation: Ansa cervicalis from (C1-C3 spinal nerves)

Answer 15

Sternohyoid

Question 16

Origin: upper border of the scapula and intermediate tendon
Insertion: intermediate tendon and hyoid bone
Function: depress the hyoid and the larynx
Innervation: Ansa Cervicalis and superior ramus (C1-C3)

Answer 16

Omohyoid

Question 17

Origin: oblique line of the thyroid
Insertion: hyoid bone, inferior margin
Action: depress hyoid or elevate thyroid cartilage
Innervation: Cervical plexus (C1)

Answer 17

Thyrohyoid

Question 18

Origin: manubrium sterni and first costal cartilage
Insertion: oblique line of thyroid
Action: depresses thyroid cartilage
Innervated: Spinal nerve C1-C2

Answer 18

Sternothyroid

Question 19

Chose a suprahyoid extrinsic laryngeal muscle:
a) omohyoid muscle
b) posterior cricoarytenoid muscle
c) cricothyroid muscle
d) lateral cricoarytenoid muscle
e) posterior belly of digastric muscle

Answer 19

E

Question 20

All of the following are infrahyoid laryngeal muscles except for;
a) sternothyroid
b) sternohyoid
c) mylohyoid
d) omohyoid
e) thyrohyoid

Answer 20

C

Question 21

The function of a suprahyoid muscle is to ________:
a) elevate the larynx
b) lower the larynx
c) raise the hyoid
d) a and c
e) none of the above

Answer 21

D

Question 22

Which muscles elevate or depress the laryngeal structure and are also important for swallowing?

Answer 22

Extrinsic laryngeal muscles

Question 23

TRUE or FALSE:
Primary responsibility of extrinsic laryngeal muscles is to control fine movement of the vocal folds for speech production such as adduction or abduction

Answer 23

False
That is intrinsic muscles