8d46The Oral Cavity

7/29/2019 8d46The Oral Cavity

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Dr. Lorena C. Balacanao


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The External Mouth

Composes primarilyof the upper andlower lip

Separated to theskin by vermillionborder

Bounded

Superiorly Philtrum

Supero-laterally-Naso-labial fold

Inferiorly-

Mento-labial fold


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Parts of the External mouth

Philtrum

Vermillion

borderMento-labialfold

Naso-labialfold

Angle ofthemouth

Oralfissure

Upperlip

Lower lip


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Muscle that supports the external

mouth is the Orbicularis OrisMuscle


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Functions of

mouth1. The first part of

digestive systemwherein masticationoccur.

2. It receives food

(ingestion) and breakup the food intosmaller pieces(digestion).

3. Takes part in

respiration as well asin speech production

4. Lastly it conveysemotion


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The 2 divisionsof the oral cavity

1. Oral vestibule

2. Oral cavity proper

The Internal Mouth


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The Oral

vestibuleA slit like spacebounded

Laterallyby cheek

and lips

Mediallyby the

buccal and labialsurfaces of the

upper and lowerteeth

Posteriorlyby theRetromolar area


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Parts A- attachedgingiva

B- Free gingiva C- Upper labial

frenum

D- Mucobuccalfold

E- InterdentalPapilla

F- Cheek G- Oral vestibula

I- Mucolabial fold


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Oral vestibule

Oral vestibule- Leftside

Oral vestibule- rightside


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Part

Upper buccalfrenum

Lower buccalfrenum


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The oralcavity

properBounded

Laterallyby palatal andlingual surfaces of theupper and lower teeth

Superiorlyby the palate(hard & soft)

Inferiorlyby the tongue

and or the floor of themouth

Posteriorlyby theisthmus of fauces


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Part of the Oralcavity proper

Hard Palate

Uvula

Palatoglossalarch

Palatine

tonsil

Tongue


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Superior boundary

Palate- PartsIncisisve papilla

Palatine Rugae

Median

palatineraphe

Maxillary

tuberosity

FoveaPalatina


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Bony framework of the hard palate

Palatineprocess ofthe maxilla

Horizontalplate of the

palatine bone


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InferiorboundaryThe Floor of the mouth

Parts

Ventralsurface of thetongue

LingualFrenulum

Sublingualfold

Sublingualcaruncle


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The tongue

Composes of

Anterior 2/3 (body)andPosterior 1/3 (root)

Presence of lingualpapillae that containstaste buds

namely:Filiform papilla

Fungiform papilla

Foliate papilla

Circumvallate papilla


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Nerve Innervations

Anterior 2/3 of thetongue

Posterior 1/3 of thetongue

Taste sensation Chorda tympani of

the VII CN or facialnerve

General Sensation

Lingual Nerve of themandibular division ofV CN or TrigeminalNerve

Taste and generalsensation is by

IX CN orglossopharyngeal

Nerve and X CN or Vagus nerve

via internal laryngealNerve


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Muscles of the tongue

Both is innervated by theXII CN or Hypoglossalnerve

Extrinsic muscles

1. Genioglossus

2. Hyoglossus

3. Stlyoglossus 4. Palatoglossus

Its action is to changethe size or mass of

the tongue

Intrinsic muscles 1. Superior

longitudinal M

2. Inferior

longitudinal 3.Transversus M

4. Vertical M

Its action is to change

the shape or form ofthe tongue


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Extrinsic Musclesof the tongue

GenioglossusMuscle


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Extrinsic Muscleof the tongue

Styloglossus

muscle


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Intrinsic musclesof the tongue

Superior

longitudinal

Muscle

Vertical and

Transverse

Muscle

Inferior

longitudinal

Muscle


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Posterior boundary

Isthmus of fauces-parts

Isthmus offauces

Uvula

Palatopharyngeal

arch


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The Salivary Glands

1. Parotid Gland- thelargest of the 3salivary gland

Located anterior tothe ear, extendingfrom the cheekbone up to thelower jaw

Parotid orStensens duct

opens at the oralvestibule oppositeupper second molar

2. Submaxillary orsubmandibula gland-

Located at the floor ofthe mouth posteriorlyoccupying the digastrictriangle

Whartons duct opens

at the sublingualcaruncle

3. Sublingual gland

Located at the floor ofthe mouth anteriorly

Bartolins and Ravinisare the duct of SL glandopens at the sublingualfold


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The Salivary glands

Sublingual gland

Submaxillary gland


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Anterior teeth

Central Incisor

Canine

Lateral Incisor


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Posterior teeth

2nd molar

1st molar

2nd premolar

1st premolar


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Upper permanentteeth

Central incisor

Lateral incisor

Canine

1st premolar

2nd premolar

1st molar

2nd molar


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Anterior teeth

Central incisor

Lateral incisor

canine


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Posterior teeth

2nd molar

1st molar


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Smile andeverybody will smileat youRemember mouthexpresses differenttype of emotions


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Thank you-The End

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8d46The Oral Cavity