Oral Anatomy

Question 1

What is Position of oral Cavity

Answer 1

Anterior border - lip
Posterior border - Oropharynx
Superior border - hard palate
Inferior border - floor of mouth

Question 2

Oral cavity derived into?

Answer 2

Vestibules - distance between lip and teeth
Oral cavity - cavity between teeth and pharynx

Question 3

Lip muscle

Answer 3

ORBICULARIS ORIS

Question 4

Cheeks

Answer 4

Buccinator muscle - opening of parotid gland visible opposite maxillary second molar

Question 5

Gingiva?

Answer 5

Alveolar, mucogingival junction, attached and free gingival, marginal gingiva.

Question 6

Fraenum

Answer 6

Epithelium fold of mucosa

Question 7

Maxillary Tuberosity

Answer 7

Round prominence of bone behind last maxillary molar

Question 8

Retro molar area

Answer 8

Triangle behind last mandibular molar

Question 9

Saliva

Answer 9

PH of mouth- 6.5
Watery liquid secreted into mouth by glands providing lubrication for chewing and swallowing and aid digestion.
- unsimulated Adult date 0.3 -0.5 ml per min
- simulated - 1-2 ml
- 99% water + waste product, protein, enzymes, hormones, immunoglobin.
Functions: Remineralisation, protection, lubrication, digestion, buffering, water balance, taste, mastications .

Question 10

The Oral Balance

Answer 10

Demineralisation - bacteria plaque + carbohydrates

Remineralisation- Salive+ OH+ fluoride+ natural protective factors

Question 11

Minor salivary glands

Answer 11

Cluster of small glands formed in sub mucosa ducts ,open in mouth

Question 12

Major salivary glands

Answer 12

1- Parotid gland - 14-28 grams, lies infratemporal fossa b/w mastoid process and border of ramus of mandible , angle of mandible . largest gland , Duct - Stensons duct 5cm open upper 6-7 molars. Saliva 25% serous.

2- submandibular gland- second largest, Duct Whartons duct above mylohyoid muscle open lingual frenum , sub lingual papillae . Saliva mucous and serous

3- sublingual gland- smallest , sub lingual fossa , Duct- Not one common duct. Bartholium duct and Rivinus . Saliva mucous

Question 13

Muscles of mastication

Answer 13

Masseter
Temporalis
Medial pterygoid
Lateral pterygoid

Question 14

Masseter

Answer 14

• Square shape, muscle powerful, thick
• origin zygomatic arch, insertion Ramus.
• action close mouth
  Clench your teeth to palpate your Masseter

Question 15

Which muscle use to maintain central occlusion for wax bite ?

Answer 15

Masseter

Question 16

Temporalis muscle

Answer 16

-Fan shape
- Origin temporal bone insertion coronoid process
- action closes mouth and pull jaw back.

Question 17

Which muscle use to bring jaw back when you are bite in Normal occlusion?

Answer 17

Temporalis

Question 18

Lateral Pterygoid

Answer 18

• Short cone shaped muscle ( two heads)
• Origin 2 head sphenoid bone and lateral pterygoid plate . Insertion- condyle and capsule of TMJ
  Action- jaw side to side , push jaw forward, opening and depressing mandible.

Question 19

Which muscle Protude jaw for bite registration for functionals?

Answer 19

Lateral Pterygoid

Question 20

Medial pterygoid

Answer 20

Origin - lateral pterygoid plate superficial maxilla tuberosity
Insertion- ramus and angle of mandible
Action - close mouth

Question 21

Summary of Jaw movements?
Mouth close

Answer 21

• Masseter, Temporalis and medial pterygoid

Question 22

Opening and Protraction

Answer 22

Lateral pterygoid

Question 23

Retraction

Answer 23

Temporalis muscle

Question 24

Which muscle pull to take Intra oral photos ?

Answer 24

ORBICULARIS oris

Question 25

Which muscle control size of vestibules?

Answer 25

Buccinator

Question 26

Which facial muscle is not attached to bone?

Answer 26

ORBICULARIS oris

Question 27

Which muscle cause grinning ?

Answer 27

RISORIUS

Question 28

Which muscle draw corner of mouth up and down during laugh?

Answer 28

Zygomatic muscles

Question 29

Which muscle cause smile expression?

Answer 29

Zygomatic major

Question 30

Which muscle cause half Smile?

Answer 30

Zygomatic minor

Question 31

Levator labii superior

Answer 31

-Raise upper lip - flare nostrils - wrinkle nose

Question 32

Which muscle use for habitual incompetency or pout?

Answer 32

Mentalis

Question 33

Buccinator

Answer 33

-Keep Blous of food during chewing and swallowing. - compress cheek to teeth

Question 34

Platysma

Answer 34

-Wrinkle skin of neck - lower jaw -lower lip

Question 35

Innervation of muscle of facial expression Innvervation of muscle of mastications,

Answer 35

Facial - 7th cranial nerve- Mastication - 5th trigeminal nerve (if damage chronic burning pain and difficulty chewing)

Question 36

What is Tongue? Part of tongue? Function?

Answer 36

- Tongue is muscular, mobile organ which lies in floor of mouth. - Root, tip , 2/3 of dorsum covered with papillae (taste buds), ventral 4 functions : chewing , taste, swallowing, speak, Natural cleansing, protection,

Question 37

Muscle of Tongue?

Answer 37

Etrinsic - outside tongue move tongue alter shape Intrinsic - produce changes in shape.