Oral Cavity and Floor of Mouth

Question 1

What forms the roof of the oral cavity?

Answer 1

Hard and soft palate

Question 2

What forms the floor of the oral cavity?

Answer 2

Mainly soft tissues including the tongue

Question 3

What forms the lateral borders of the oral cavity?

Answer 3

The cheeks

Question 4

What separates the oral cavity into the oral vestibule and oral cavity proper?

Answer 4

The dental arches

Question 5

What is posterior to the oral cavity?

Answer 5

The oropharynx

Question 6

Describe the lips

Answer 6

Anterior border of oral cavity
Composed of soft tissue and lined externally by skin and internally by oral mucosa
Main muscular component is the orbicularis oris

Question 7

Describe the cheeks

Answer 7

Composed of muscle and fascia
Lined superficially with skin and deep with oral mucosa
Main muscular component is the buccinator

Question 8

Name the frenum found in the oral cavity

Answer 8

Labial frenulum (upper and lower)
Buccal frenulum

Question 9

What muscles form the floor of the mouth?

Answer 9

A muscular diaphragm created by the paired mylohyoid muscles
These attach in the midline to the mylohyoid raphe
The geniohyoid sits superior to the mylohyoid
Superior to both of these is the tongue

Question 10

What separates the anterior and posterior parts of the tongue?

Answer 10

The terminal sulcus

Question 11

How is the tongue split?

Answer 11

Anterior 2/3 - in the oral cavity
Posterior 1/3 - anterior wall of the oropharynx

Question 12

Which papilla cover the surface of the tongue?

Answer 12

Fungiform
Foliate
Vallate
Filiform

Question 13

Which papilla of the tongue have no tastebuds?

Answer 13

Filiform

Question 14

What can be seen on each side of the frenulum of the tongue?

Answer 14

The lingual vein
Sublingual folds

Question 15

What are the intrinsic muscles of the tongue?

Answer 15

Superior longitudinal
Vertical
Transverse
Inferior longitudinal

Question 16

What do the intrinsic tongue muscles do?

Answer 16

Change the size and shape of the tongue

Question 17

What are the extrinsic muscles of the tongue?

Answer 17

Palatoglossus
Styloglossus
Hyoglossus
Genioglossus

Question 18

What do the extrinsic muscles of the tongue do?

Answer 18

Originate from outside the tongue and are responsible for protruding, retracting, elevating and depressing the tongue

Question 19

In relation to the tongue, what does the genioglossus do?

Answer 19

Important in protruding the tongue

Question 20

What does the hyoglossus do?

Answer 20

Important for depressing the sides of the tongue

Question 21

Where does the lingual artery enter the tongue?

Answer 21

Between the hyoglossus and genioglossus

Question 22

Where do the hypoglossal and lingual nerves enter the tongue?

Answer 22

On the external surface of the hyoglossus

Question 23

What does the styloglossus do?

Answer 23

Important in elevating and retracting the tongue

Question 24

What is the palatoglossus?

Answer 24

A muscle of the tongue and palate
Fibres pass inferiorly to blend with intrinsic muscles on the lateral surface of the tongue

Question 25

What supplies motor innervation to the tongue?

Answer 25

All muscles of the tongue are supplied by the hypoglossal nerve except the palatoglossus which is supplied by the vagus nerve

Question 26

What supplies general sensation (pressure, temperature, pain) to the tongue?

Answer 26

Anterior 2/3 - mandibular nerve (trigeminal)
Posterior 1/3 - glossopharyngeal nerve

Question 27

What supplies special sensation (taste) to the tongue?

Answer 27

Anterior 2/3 - facial nerve via chordae tympani
Posterior 1/3 - glossopharyngeal nerve

Question 28

What artery supplies the tongue?

Answer 28

The lingual artery is the major arterial supply (from the external carotid)

Question 29

Which veins drain the tongue?

Answer 29

Deep lingual and dorsal lingual veins drain the tongue
Both drain into the internal jugular vein