Neck Muscles

Question 1

what muscles elevate the hyoid bone?

Answer 1

mylohyoid, geniohyoid, stylohyoid, diagastric

Question 2

what innervates the mylohyoid?

Answer 2

nerve to mylohyoid (V3)

Question 3

what innervates the geniohyoid?

Answer 3

C1 fibers (runs with CN XII)

Question 4

what innervates the stylohyoid?

Answer 4

cervical branch of facial (CN VII)

Question 5

what innervates the digastric?

Answer 5

“DI”-gastric… two bellies

anterior belly: nerve to mylohyoid (V3)
posterior belly: facial (VII)

Question 6

what muscles depress the hyoid bone?

Answer 6

sternohyoid, sternothyroid, omohyoid, thyrohyoid

Question 7

what innervates the sternohyoid?

Answer 7

C1, C2, C3 (ana cervicalis)

Question 8

what innervates the sternothryoid?

Answer 8

C1, C2, C3 (ana cervicalis)

Question 9

what innervates the omohyoid?

Answer 9

C1, C2, C3 (ana cervicalis)

Question 10

what innervates the thyrohyoid?

Answer 10

C1 fibers (run with CN XII)

Question 11

what are the longitudinal muscles of the pharynx?

Answer 11

stylopharyngeus, salpingopharyngeus, palatopharyngeus

Question 12

what are the actions of the longitudinal muscles of the pharynx?

Answer 12

elevates the pharynx and the larynx

except the salpingopharyngeus, which only elevates the pharynx

Question 13

what innervates the stylopharyngeus?

Answer 13

glossopharyngeal nerve

Question 14

what innervates the salpingopharyngeus?

Answer 14

vagus nerve (pharyngeal plexus)

Question 15

what innervates the palaopharyngeus?

Answer 15

vagus nerve (pharyngeal plexus)

Question 16

what are the circular muscles of the pharynx?

Answer 16

superior constrictor, middle constrictor, inferior constrictor

Question 17

what is the action of the circular muscles of the pharynx?

Answer 17

constricts the pharynx

Question 18

what innervates the circular muscles of the pharynx?

Answer 18

vagus nerve (pharyngeal plexus)

except the inferior constrictor is also innervated by the external branch of the superior laryngeal nerve of X and the recurrent laryngeal nerve

Question 19

what is the action of the lateral cricoarytenoid?

Answer 19

adducts the vocal ligament and assists in closing the glottis

Question 20

what is the action of the posterior cricoartenoid?

Answer 20

abducts the vocal ligament and opens the glottis

Question 21

what is the action of the thyroarytenoid?

Answer 21

relaxes the vocal ligament

Question 22

what is the action of the vocalis?

Answer 22

regulates tension of segments of vocal ligament

Question 23

what is the action of the cricothyroid?

Answer 23

tenses vocal cords

Question 24

what is the action of the transverse arythenoid?

Answer 24

closes glottis by adducting arytenoid cartilage

Question 25

what is the action of the aryepiglotticus?

Answer 25

narrows inlet of larynx

Question 26

what innervates the muscles that act on the larynx?

Answer 26

recurrent laryngeal nerve of X EXCEPT the cricothyroid is innervated by the external branch of superior laryngeal nerve of X