Oral Cavity

Question 1

What are the parts of the mouth cavity?

Answer 1

Mouth Cavity Proper: Space between Upper and Lower Alveolar Arches
Vestibule: Space between teeth and gums on one side and lips and cheeks on the other

Question 2

Oral Cavity is lined with …

Answer 2

stratified squamous epithelium

Question 3

Gingiva, Hard Palate and Dorsum of Tongue are …

Answer 3

slightly keratinized

Question 4

Boundaries of Oral Cavity

Answer 4

Anterior: Lips
Posterior: Continuous with Oropharynx
Lateral: Cheeks
Superior: Palate
Inferior: Tongue

Question 5

What are the components of the Oral Cavity?

Answer 5

Lips
Cheeks
Teeth
Palate
Tongue

Question 6

Lips
Formed from?

Answer 6

Orbicularis Oris

Question 7

Lips
What covers the lips externally?

Answer 7

Skin

Question 8

Lips
What covers the lips internally?

Answer 8

Mucous Membrane

Question 9

Lips
What connects the Lips to the Gums?

Answer 9

Midline structure called Labial Frenula

Question 10

Cheeks
Which muscle forms the cheeks?

Answer 10

Buccinator

Question 11

Cheeks
Function of Buccinator Muscle in Cheeks?

Answer 11

Prevents accumulation of food in Vestibule

Question 12

Cheeks
What separates Cheeks from Lips?

Answer 12

Nasolabial Folds

Question 13

Teeth
Teeth changes by age

Answer 13

Deciduous Teeth: 6 months - 2 years
Permanent Teeth: 6 - 12 years
Wisdom Teeth (3rd Molar): 17 - 25 years

Question 14

Teeth
Number of Teeth

Answer 14

4 Incisors
2 Canines
4 molars (3rd molar develops later)

Question 15

Teeth
Bones forming Jaw

Answer 15

Upper Jaw: Maxillary Bone
Lower Jaw: Mandible

Question 16

Palate
Parts of the Palate

Answer 16

Hard Palate (anterior)
Soft Palate (posterior)

Question 17

Palate
Components of Hard Palate?

Answer 17

Maxilla
Palatine Bone

Question 18

Palate
Posterior Part of Soft Palate is the …

Answer 18

uvula

Question 19

Palate
Muscles of Soft Palate?

Answer 19

Tensor Palati
Levator Palati
Musculus Uvulae
Palatoglossus

Question 20

Palate
Tensor Palati: Origin

Answer 20

Eustachian Tube and Scaphoid Fossa

Question 21

Palate
Tensor Palati: Insertion

Answer 21

Tendons fuse forming Palatine Aponeurosis which inserts into Margin of Palatine Bone

Question 22

Palate
Tensor Palati: Action

Answer 22

Tenses the Palate

Question 23

Palate
Levator Palati: Origin

Answer 23

Eustachian Tube and Petrous Bone

Question 24

Palate
Levator Palati: Insertion

Answer 24

Palatine Aponeurosis

Question 25

**Palate** Levator Palati: Action

Answer 25

Elevate Tensed Palate to shut the Nasopharynx from Oropharynx

Question 26

**Palate** Musculus Uvulae: Origin

Answer 26

Palatine Aponeurosis

Question 27

**Palate** Musculus Uvulae: Insertion

Answer 27

Mucosa of Uvula

Question 28

**Palate** Musculus Uvulae: Action

Answer 28

Tenses Uvula

Question 29

**Palate** Palatoglossus: Origin

Answer 29

Palatine Aponeurosis

Question 30

**Palate** Palatoglossus: Insertion

Answer 30

Side of Tongue

Question 31

**Palate** Palatoglossus: Action

Answer 31

Raises Tongue

Question 32

**Palate** Sensory Nerve Supply

Answer 32

**Hard Palate**: Greater Palatine and Nasopalatine Nerves **Soft Palate**: Lesser Palatine Nerve

Question 33

**Palate** Motor Nerve Supply

Answer 33

Cranial Accessory Nerve Only Tensor Palati supplied by Medial Pterygoid (from Trigeminal Nerve)

Question 34

**Tongue** Functions

Answer 34

Taste Mastication Speech Deglutition

Question 35

**Tongue** What structure connects the tongue to the floor of the mouth?

Answer 35

Connected in the midline by Frenulum

Question 36

**Tongue** Structures lateral to Frenulum

Answer 36

**Immediately Lateral**: Submandibular Ducts opening into Sublingual Papillae **Further Lateral**: Sublingual Salivary Glands

Question 37

**Tongue** Divisions of Tongue

Answer 37

Anterior 2/3 = Oral Part Posterior 1/3 = Pharyngeal Part Divided by Terminal Sulcus

Question 38

**Tongue** What is the Foramen Caecum?

Answer 38

Depression at site of Thyroid Rudiment

Question 39

**Tongue** Components of each part of the tongue

Answer 39

**Oral Part**: Vallate, Fungiform, Filiform and Foliate Papillae **Pharyngeal Part**: Lingual Tonsil

Question 40

**Tongue** Pillars of each side of the Tongue

Answer 40

**Palatoglossal Arch**: Connects Palate to Tongue **Palatopharyngeal Arch**: Connects Palate to Pharynx

Question 41

**Tongue** Location of Tonsils

Answer 41

Between the arches on either side of the Tongue

Question 42

**Tongue** How is the Tongue connected to the Epiglottis?

Answer 42

Median Epiglottic Fold Pair of Lateral Epiglottic Folds

Question 43

**Tongue** What is the Valecula?

Answer 43

Depression on either side of Median Epiglotic Fold

Question 44

**Tongue** Types of Tongue Muscles

Answer 44

**Extrinsic**: Alter Position of Tongue **Intrinsic**: Alter Shape of Tongue

Question 45

**Tongue** What are the four pairs of Extrinsic Muscles?

Answer 45

Genioglossus Hyoglossus Styloglossus Palatoglossus

Question 46

**Tongue: Extrinsic Muscles** Genioglossus: Origin

Answer 46

Genial Tubercles of Mandible

Question 47

**Tongue: Extrinsic Muscles** Genioglossus: Insertion

Answer 47

Superior Surface of Tongue

Question 48

**Tongue: Extrinsic Muscles** Genioglossus: Action

Answer 48

Bring Tongue forward

Question 49

**Tongue: Extrinsic Muscles** Styloglossus: Origin

Answer 49

Styloid Process of Skull

Question 50

**Tongue: Extrinsic Muscles** Styloglossus: Insertion

Answer 50

Inferior Surface of Tongue

Question 51

**Tongue: Extrinsic Muscles** Styloglossus: Action

Answer 51

Pull Tongue Backward

Question 52

**Tongue: Extrinsic Muscles** Palatoglossus: Action

Answer 52

Elevates Root of Tongue shutting oral Cavity from Oropharynx

Question 53

**Tongue: Extrinsic Muscles** Hyoglossus: Origin

Answer 53

Hyoid Bone

Question 54

**Tongue: Extrinsic Muscles** Hyoglossus: Insertion

Answer 54

Side of Posterior 1/2 of Tongue

Question 55

**Tongue: Extrinsic Muscles** Hyoglossus: Action

Answer 55

Pull Tongue Downward and Backward

Question 56

**Tongue** What are the Intrinsic Muscles?

Answer 56

**Superior Longitudinal Muscle** **Inferior Longitudinal Muscle**: Shortens Tongue **Transverse Muscle**: Narrows and Elongates Tongue **Vertical Muscle**: Flattens and Broadens Tongue

Question 57

**Tongue** Sensory Nerve Supply

Answer 57

**Anterior 2/3**: Taste by Chorda Tympani of Facial Nerve + Touch and Temperature by Lingual Branch of Trigeminal **Posterior 1/3**: Taste, Touch and Temperature by Glossopharyngeal Nerve **Vallecula**: Vagus Nerve

Question 58

**Tongue** Motor Nerve Supply

Answer 58

Hypoglossal Nerve Only Palatoglossus supplied by Cranial Accessory Nerve

Question 59

Muscles of Mastication

Answer 59

Lateral Pterygoid Medial Pterygoid Temporalis Masseter Muscle

Question 60

**Lateral Pterygoid** Origin

Answer 60

**Upper Head**: Greater Wing of Sphenoid **Lower Head**: Lateral Pterygoid Plate

Question 61

**Lateral Pterygoid** Insertion

Answer 61

Pterygoid Fovea Capsule and Articular Disc of Temporomandibular Joint

Question 62

**Lateral Pterygoid** Nerve Supply

Answer 62

Nerve to Lateral Pterygoid (branch from anterior division of Mandibular Nerve)

Question 63

**Lateral Pterygoid** Action

Answer 63

Protrusion of Mandible Chewing with Medial Pterygoid

Question 64

**Medial Pterygoid** Origin

Answer 64

**Deep Head**: Lateral Pterygoid Plate **Superificial Head**: Tuberosity of Maxilla

Question 65

**Medial Pterygoid** Insertion

Answer 65

Medial Surface of Ramus and Angle of Mandible

Question 66

**Medial Pterygoid** Nerve Supply

Answer 66

Nerve to Medial Pterygoid (branch from Trunk of Mandibular Nerve)

Question 67

**Medial Pterygoid** Action

Answer 67

Elevation of Mandible Chewing movements of Mandible

Question 68

**Temporalis** Origin

Answer 68

Floor of Temporal Fossa

Question 69

**Temporalis** Insertion

Answer 69

Coronoid Process of Mandible

Question 70

**Temporalis** Nerve Supply

Answer 70

Temporal Nerves

Question 71

**Temporalis** Action

Answer 71

**Vertical Fibers**: Elevates Mandible **Horizontal Fibers**: Retracts Mandible

Question 72

**Masseter Muscle** Origin

Answer 72

Inferior Border of Zygomatic Arch

Question 73

**Masseter Muscle** Insertion

Answer 73

Lateral Surface of Ramus of Mandible

Question 74

**Masseter Muscle** Nerve Supply

Answer 74

Masseteric Nerve

Question 75

**Masseter Muscle** Action

Answer 75

Elevation of Mandible