Floor of Mouth and Tongue

Question 1

What are the boundaries of the oral cavity?

Answer 1

1. Anterior - alveolar/dental arches of mandible & maxilla
2. Posterior - oropharangeal isthmus - space bounded laterally by palatoglossal folds
3. Roof - hard palate & soft palate
4. Floor - tongue, muscles of floor of mouth

Question 2

What is the functions of the tongue?

Answer 2

• formation of a food bolus
• pushing away food bolus to the posterior part of the oral cavity ready to be swalloed
• keeping the mouth clean
• speech
• tasting & sensing the food

Question 3

What is the difference in intrinsic & extrinsic muscle groups of the tongue?

Answer 3

Intrinsic muscles originate & insert within the tongue

Extrinsic muscles originate outwith the tongue and insert into it

Question 4

What do intrinsic muscles of the tongue do?

Answer 4

intrinsic muscles act to alter the shape of the tongue

• longitudinal muscles: make tongue short & thick
• transverse & vertical muscles: make tongue long & narrow

Question 5

What are all tongue muscles innerveated by except the palatoglossus?

Answer 5

ALL tongue muscles supplied by CN XII except palatoglossus (muscle of palate supplied by CN X)

Question 6

What is the CLINICAL TESTING OF CN XII, HYPOGLOSSAL NERVE?

Answer 6

Ask your patient to ‘stick their tongue straight out’

• If both CN XIIs are normal, the tongue tip should stick out and remain in the midline
• If one CN XII is damaged, the tongue tip will point towards the side of the injured nerve

Question 7

Which nerve carries pre-synaptic parasympathetic fibres to the submandibular ganglion?

Answer 7

Chorda tympani

Question 8

The labial alveolar mucosa extends between the boundaries of which teeth?

Answer 8

3-3

Question 9

Which papillae of the tongue are supplied by CN V3?

Answer 9

Filiform

Question 10

Which muscle forms the lateral boundary of the oral cavity?

Answer 10

Buccinator

Question 11

Which nerve nerve passes inferior to the submandibular duct int he floor of the mouth?

Answer 11

Lingual nerve

Question 12

Which tongue muscle(s) is supplied by the vagus nerve?

Answer 12

Palatoglossus

Question 13

The oropharyngeal isthmus marks which boundary of the oral cavity?

Answer 13

Posterior

Question 14

The sublingual papillae serve as openings for saliva from which gland?

Answer 14

Submandibular gland

Question 15

Which muscle does the superficial and deep parts of the submandibular salivary gland hook around?

Answer 15

Mylohyoid

Question 16

Which cranial nerve supplies special sensation to the posterior 1/3 of the tongue?

Answer 16

CN IX

Question 17

Answer 17

Question 18

Answer 18

Question 19

Answer 19

Question 20

Answer 20

Question 21

Answer 21