Extrinsic Laryngeal Muscle

Question 1

Elevators of hyoid and larynx

Answer 1

digastricus anterior
digastricus posterior
stylohyoid
mylohyoid
geniohyoid
hyoglossus
genioglossus
inferior pharyngeal constrictor
-thyropharyngeus
-cricopharyngeus

Question 2

Digastricus anterior

Answer 2

origin- inner surface of mandible
insertion- joins posterior digastricus by means of intermediate tendon.
action- draws hyoid up and forward

Question 3

Digastricus posterior

Answer 3

origin- mastoid process of temporal bone behind ear
insertion- hyoid bone
action- draws hyoid up and back

Question 4

Stylohyoid

Answer 4

origin- styloid process of temporal bone
insertion- corpus of hyoid bone
action- elevates and retracts hyoid bone

Question 5

Mylohyoid

Answer 5

Floor of oral cavity
origin- underside of mandible
insertion- corpus of hyoid bone
action- elevates hyoid and projects it forward or depresses mandible

Question 6

Geniohyoid

Answer 6

origin- mental spines of mandible
insertion- hyoid bone at corpus
action- elevates hyoid and draws it forward

Question 7

Hyoglossus

Answer 7

origin- entire surface of greater cornu of hyoid bone
insertion- sides of tongue
action- hyoid elevator, lingual depressor

Question 8

Genioglossus

Answer 8

origin- inner surface of mandible
insertion- anterior surface of hyoid corpus
action- hyoid elevator

Question 9

Inferior pharyngeal constrictor- thyropharyngeus

Answer 9

Propels food through the pharynx

action- contraction promotes elevation of larynx while constricting the pharynx

Question 10

Inferior pharyngeal constrictor- cricopharyngeus

Answer 10

Sphincter muscle at esophagaus orifice

action- contraction promotes elevation of larynx while constricting pharynx

Question 11

Depressors of hyoid & larynx

Answer 11

sternohyoid
omohyoid
sternothyroid
thyrohyoid

Question 12

Sternohyoid

Answer 12

origin- post superior region of manubrium sterni and medial end of clavicle
insertion- inferior margin of hyoid corpus
action- depresses hyoid

Question 13

Omohyoid- superior belly

Answer 13

Terminates on side of hyoid corpus
Joins at intermediate tendon with inferior belly
action- depresses hyoid and larynx

Question 14

Omohyoid- inferior belly

Answer 14

Originates on upper border of scapula
Joins at intermediate tendon with superior belly
action- depresses hyoid and larynx

Question 15

Sternothyroid

Answer 15

origin- manubrium sterni and 1st costal cartilage
insertion- oblique line of thyroid cartialge
action- depresses thyroid cartilage

Question 16

Thyrohyoid

Answer 16

origin- oblique line of thyroid cartilage
insertion- greater cornu of hyoid bone
action- depresses hyoid and raises larynx

Question 17

Extrinsic laryngeal musculature

Answer 17

1 attachment on a laryngeal cartilage, other on nonlaryngeal structure. Responsible for major adjustments of the larynx- elevators & depressors.