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Orthodontics > Oral Anatomy > Flashcards

Oral Anatomy Flashcards

1
Q

What is Position of oral Cavity

A

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

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2
Q

Oral cavity derived into?

A

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

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3
Q

Lip muscle

A

ORBICULARIS ORIS

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4
Q

Cheeks

A

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

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5
Q

Gingiva?

A

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

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6
Q

Fraenum

A

Epithelium fold of mucosa

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7
Q

Maxillary Tuberosity

A

Round prominence of bone behind last maxillary molar

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8
Q

Retro molar area

A

Triangle behind last mandibular molar

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9
Q

Saliva

A

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 .

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10
Q

The Oral Balance

A

Demineralisation - bacteria plaque + carbohydrates

Remineralisation- Salive+ OH+ fluoride+ natural protective factors

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11
Q

Minor salivary glands

A

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

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12
Q

Major salivary glands

A

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

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13
Q

Muscles of mastication

A

Masseter
Temporalis
Medial pterygoid
Lateral pterygoid

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14
Q

Masseter

A
  • Square shape, muscle powerful, thick
  • origin zygomatic arch, insertion Ramus.
  • action close mouth
    Clench your teeth to palpate your Masseter
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15
Q

Which muscle use to maintain central occlusion for wax bite ?

A

Masseter

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16
Q

Temporalis muscle

A

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

17
Q

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

A

Temporalis

18
Q

Lateral Pterygoid

A
  • 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.
19
Q

Which muscle Protude jaw for bite registration for functionals?

A

Lateral Pterygoid

20
Q

Medial pterygoid

A

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

21
Q

Summary of Jaw movements?
Mouth close

A
  • Masseter, Temporalis and medial pterygoid
22
Q

Opening and Protraction

A

Lateral pterygoid

23
Q

Retraction

A

Temporalis muscle

24
Q

Which muscle pull to take Intra oral photos ?

A

ORBICULARIS oris

25
Q

Which muscle control size of vestibules?

A

Buccinator

26
Q

Which facial muscle is not attached to bone?

A

ORBICULARIS oris

27
Q

Which muscle cause grinning ?

A

RISORIUS

28
Q

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

A

Zygomatic muscles

29
Q

Which muscle cause smile expression?

A

Zygomatic major

30
Q

Which muscle cause half
Smile?

A

Zygomatic minor

31
Q

Levator labii superior

A

-Raise upper lip
- flare nostrils
- wrinkle nose

32
Q

Which muscle use for habitual incompetency or pout?

A

Mentalis

33
Q

Buccinator

A

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

34
Q

Platysma

A

-Wrinkle skin of neck
- lower jaw
-lower lip

35
Q

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

A

Facial - 7th cranial nerve
Mastication - 5th trigeminal nerve

36
Q

What is Tongue?
Part of tongue?
Function?

A
  • 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,
37
Q

Muscle of Tongue?

A

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

Orthodontics (45 decks)

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