Oral Cavity

Question 1

What makes up the lateral walls of the oral cavity?

Answer 1

Buccinator

Question 2

What structure forms the diaphragm of the mouth?

Answer 2

Mylohyoid

Question 3

Attachment sites for geniohyoid and genioglossus

Answer 3

Geniohyoid - inferior genial tubercle of mandible

Genioglossus - superior genial tubercle

Question 4

list the supra hyoid muscles

Answer 4

Geniohyoid

Mylohyoid

Anterior and
Posterior belly of digastric

Stylohyoid

Question 5

Which suprahyoid muscles are innervated by the facial nerve?

Answer 5

Posterior belly of digastric

Stylohyoid

Lie either side of stylomastoid foramen where facial nerve passes

Question 6

Which supra hyoid muscles are innervated by CNV3?

Answer 6

Anterior belly of digastric

Mylohyoid

Question 7

Innervation of geniohyoid?

Answer 7

C1 in hypoglossal

this is because geniohyoid sits close to hypoglossal nerve

Question 8

Innervation of sublingual salivary gland

Answer 8

Facial CN VII

Question 9

Innervation of parotid gland?

Answer 9

Glossopharyngeal (IX)

Question 10

Innervation of submandibular saliva glands?

Answer 10

Facial CN VII

Question 11

Sensory supply to anterior 2/3rd of tongue?

Answer 11

Lingual nerve
- branch of CNV3

Taste fibres also carried by lingual but originate from facial and travel on chorda tympani

Question 12

Motor supply to tongue?

Answer 12

Hypoglossal nerve

Question 13

What is responsible for bumpy appearance on posterior 3rd of tongue

Answer 13

lingual tonsil

Question 14

what lymphoid tissue protects the nasopharynx?

Answer 14

Adenoid tonsils

Question 15

Action and innervation of intrinsic muscles of the tongue?

Answer 15

mould food bolus

Hypoglossal CN XII

Question 16

Name and give the action of the extrinsic muscles of the tongue?

Answer 16

Genioglossus
- Depresses tongue

Palatoglossus
- Elevates tongue

Styloglossus
- Elevates and retracts tongue

Hyoglossus
- Depresses tongue

Question 17

What is the innervation of the extrinsic muscles of the tongue?

Answer 17

Hypoglossal except palatoglossus which is CN X

Question 18

Blood supply and venous drainage of tongue

Answer 18

Lingual artery
- 2nd ant branch of external carotid

Lingual vein
- communicates with internal jugular vein

Question 19

Describe the lymphatic drainage of the tongue?

Answer 19

Tip = Submental nodes

Lateral edge = submandibular nodes

Central and posterior = deep cervical nodes

Question 20

What is the mucosa of the hard palate innervated by?

Answer 20

Facial nerve CN VII

Question 21

Blood supply to hard palate?

Answer 21

greater palatine artery

- branch of 3rd part of maxillary

Question 22

Innervation of hard palate?

Answer 22

Branches of CN V2

CN V2 only sensory

Greater palatine

Question 23

Innervation of soft palate

Answer 23

Lesser palatine
- Branch of greater palatine (CNV2) that passes posteriorly to supply soft palate

Also CN IX

Question 24

Name the muscles that move the soft palate.

Answer 24

Tensor veli palatini

Levator veli palatini

Palatoglossus

Palatopharyngeus

Musculus uvulae

Question 25

Innervation of muscles that move soft palate?

Answer 25

All CN X except tensor veli palatini

Question 26

Innervation of tensor veli palatini

Answer 26

CN V3

Question 27

Which muscle wraps its tendon around pterygoid hamulus?

Answer 27

Tensor veli palatini

Question 28

Action of the soft palate muscles?

Answer 28

Tensor veli palatini - tenses soft palate Levator veli palatini - elevates soft palate palatoglossus - elevates tongue and helps close oral cavity from oropharynx Palatopharyngeus - elevates pharynx and moves pharyngeal wall forwards towards the soft palate Musculus uvulae - elevates and retracts uvula

Question 29

Lymphatic drainage of soft palate?

Answer 29

Deep cervical nodes

Question 30

How does the facial nerve supply small glands of the palate?

Answer 30

Facial nerve sends fibres to pterygopalatine ganglion via the greater petrosal nerve which then joins CN V2

Question 31

Describe an edentulous mandible.

Answer 31

When teeth are los the alveolar bone that supported the teeth is absorbed --> reduced bone in that area. if all teeth are lost then the forces that normally pass from the teeth during mastication is lost so all supporting alveolar bone is lost

Question 32

Nerve supply to teeth and gums?

Answer 32

Branches of CN V2 supply upper, CN V3 (mental branch) supplies lower teeth and gums

Question 33

blood supply to teeth and gums?

Answer 33

alveolar branches of maxillary artery