Lecture 28 - Oral Cavity

Question 1

What is the masseter muscle3?

Answer 1

origin on mandible, runs up to the zygoma (cheek bone)

chewing muscle - mastication

Question 2

What is the features of temporalis?

Answer 2

origin along the temporal bone

projects down to the condyle of the mandible

Question 3

orbicularis is important for…

Answer 3

forming a seal around drinks, kissing

stroke victims may be compromised - can’t close their mouth properly

Question 4

What muscle fills the gap between orbicularis oris and masseter?

Answer 4

Buccinator - forms most of the cheek

Question 5

what forms the roof of the mouth:

Answer 5

Palatine process of maxilla

Question 6

going through the layers of the soft palate, what is there:

Answer 6

palatine glands

Greater palatine nerve and artery/ Lesser palatine nerve

Question 7

The Greater palatine nerve and artery/ Lesser palatine nerve project up into the

Answer 7

nasal cavity

Question 8

What makes up the floor of the mouth?

Answer 8

Mylohyoid muscle - makes up the floor

extends to the Hyoid bone

On the internal surface there is the Geniohyoid muscle

inferiorly there are a few others

Question 9

Where does the Lingual nerve go?

Answer 9

into the floor of the mouth to supply the tongue

Question 10

What innervates the lower teeth?

Answer 10

Inferior alveolar nerve

Question 11

The part sof the maxilla and Mandible that are embedding the tooth:

Answer 11

alveolar arches

Question 12

Where is the oral vestibule?

Answer 12

between cheek and teeth

Question 13

Th tongue divided by what?

Answer 13

ant 2/3 posterior 1/3

by a V-shaped groove called the sulcus terminalis

Question 14

What is deep to the mucosa on the psoterior 1/3 of the tonuge?

Answer 14

Lingual tonsils - cluster of lymphoid tissue

Question 15

What is deep to the mucosa on the anterior 2/3 of the tonuge?

Answer 15

Papillae - number of different types:

Valate papillae -at the sulcus terminalis

Foliate pappillae - posterolaterally

Fungiform papillae - on the entire surface

Question 16

What is the foramen caecum

Answer 16

depression downwards towards the neck at the apex of the sulcus terminalis

Thyroid gland develops from this - the ducts close up, this is a remnant

Question 17

The taste buds are embedded in the walls of the ____

Answer 17

pappilar - particularly the circumvalate

Question 18

Describe the filiform papillae?

Answer 18

line most of the tongue, small, don’t have taste buds

give the tongue a rough surface - to help pick up food (mostly for animals)

Question 19

What are the Extrinsic muscles of tongue?

Answer 19

Styloglossus
Palatoglossus
Genioglossus
Hyoglossus

Question 20

what are the features of Palatoglossus

Answer 20

contraction elevates the tongue - towards the palate

Question 21

what are the features of Styloglossus

Answer 21

stylo-styloid process

retracts the tongue

Question 22

what are the features of Hyoglossus

Answer 22

runs from the hyoid bone towards the tongue

depresses the tongue downwards

Question 23

what are the features of Genioglossus?

Answer 23

from the inferior surface fot he tongue

pulls the back fo the tongue forward twoards the mandible

prorusion of the tongue

Question 24

All tongue extrinsic muscles are innervated with the exception of palatoglossus - by the …

Answer 24

CNX11 - hypoglossal

palatoglossus - pharyngeal branch of Vagus

Question 25

What are the groups of intrinisic muscles?

what nerve?

Answer 25

transverse and vertical
Superior Longitudinal
Inferior longitudinal

CNX11

Question 26

What types of sensory nerves are in the tongue?

Answer 26

General sensory - touch, pressure

Special sensroy - taste

different for both to the 1/3 and 2/3s

Question 27

In the anterior 2/3 what gives the general sensroy info?

Answer 27

Lingual nerve (trigeminal branch - mandibular division)

Question 28

In the anterior 2/3 what gives the special sensroy info?

Answer 28

chorda tympani - branch of CN7

facial nerve

Question 29

In the posterior 1/3 what gives the special and general sensory info?

Answer 29

glossophrangeal (CN9)

Question 30

How many incisor, canine, premolar and molar teeth

Answer 30

4 incisors

1 canine

2 premolars

3 molars

Question 31

What innervates teeth in the maxilla?

Answer 31

superior alveolar nerve

branch of maxillary division of trigminal nerve

Question 32

What innervates teeth in the mandible?

Answer 32

inferioer alveolar nerve - runnin gin the mandibular canal

Question 33

What does the tooth crown consist of?

Answer 33

Enamel and Dentin

Question 34

What does the tooth root consist of?

Answer 34

pulp - very vascular and nerve heavy

Question 35

when do primary teeth erupt out?

Answer 35

6-24 months

Question 36

adult teeth erupt when?

Answer 36

from 7 years - front to back

Question 37

The upper and lower ____ erupt out of sequence to the rest of the teeth

Answer 37

canines - late

1st molar - earlier

Question 38

Wisdom teeth is the …

Answer 38

3rd molar

Question 39

What is the function of saliva?

Answer 39

lubricate while chewing

enzymes

antimicrobial properties

Question 40

Where is the parotid salivary gland?

Answer 40

superficial

over the top of massetor mscule - has a single duct that goes through massetor

Question 41

Where is the submandibular salivary gland?

Answer 41

wraps around the free psoterior border of mylohyoid muscle - floor of oral cavity

duct comes from the internal part that projects foraward near the lingual frenulum

Question 42

Where is the sublingualsalivary gland?

Answer 42

on the floor of the mouth - many ducts

Question 43

What other strucutre are in the floor of the mouth?

Answer 43

Lingual arteries and veins - quick absorption of drugs

hypoglossal nerve (CN12)