20 Oral Cavity

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ORAL CAVITY

PALATE

TONGUE

By

ESSAM ELDIN ABDELHADY SALAMA


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Oral cavity

Vestibule

Mouth cavity proper.


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Oral cavity

Vestibule.

Slit like space bound by ;

Lips and cheeks externally

Teeth and gum internally

Opens outside by oralfissure .


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Oral cavity

Lips; two soft folds surround

the oral fissure.

Covered by skin externally, and

mucous membrane internally. Containing orbicularis oris.

Cheeks; lie on each side oral

fissure.

Gums; dense fibrous tissue

attached to alveolar borders ofthe jaws, adherent to necks of

teeth .


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Oral cavity

Teeth ;

Primary, deciduous milkteeth

Twenty in number in both jaws.

Emerge 6 mos.

2 yrs. Replaced by permanent teeth 6-

12 yrs.

Permanent, thirty two in bothjaws.

Replace the milk teeth at 6 yrs. Wisdom teeth (3rdmolar) erupts

17-25 yrs or remains in jaw.


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Mouth cavity proper

Anteriorly and laterally

bounded by teeth, gumand alveolar arches.

Posteriorly oropharyngealisthmus, communicates itwith the oropharynx .

Roofed by hard and softpalate.

Floor is formed byanterior 2/3 of tongue, and

mucous membrane ofsides and under surface ofthe tongue.


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Floor of the mouth

Frenulum linguaeis a

median mucus fold in

the under surface of the

tongue, joins it with the

floor

Lingual foldis a mucusridge on each side of the

frenulum linguae

Sublingual papillais a

rounded elevation onthe anterior end of the

sublingual fold, in its

summit open the

submandibular duct.


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Roof of the mouth

Hard palateforms

the anterior two

thirds.

Soft palateforms

the posterior third. Uvulafleshy

median projection

of the soft palate.


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Palate

Soft palate; mobile fold

formed mostly of skeletalmuscle

Closes off the

nasopharynx during

swallowing Uvula projects

downward from its free

edge

Palatoglossal andpalatopharyngeal arches

form the borders of the

fauces


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Muscles of the palate

Levator veli palatini

Tensor veli palatini

Palatoglossus

Palatopharyngeus.

Musculus uvulae


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Muscles of the palate

Levator velipalatini

Tensor veli palatini

Palatoglossus

Palatopharyngeu.

Musculus uvulae


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Arterial supply

Greater palatine

artery (maxillary).

Ascending palatine(facial).

Palatine branch of

ascending

pharyngeal.


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Nerve supply

Sensory ;

Greater palatine.

Lesser palatine

Nasopalatine.

Pharyngeal branch of

glossopharyngeal .

Motor;

Cranial part of

accessory through

pharyngeal plexus

(except tensor palati

by mandibular).


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Tongue

Occupies the floor of the

mouth and fills the oral

cavity when mouth is

closed

Functions include:

Mixing food with saliva

and forming the bolus.

Initiation of swallowing. Speech.


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Tongue

Intrinsic muscles

change the shape of

the tongue Extrinsic muscles alter

the tongues position

Lingual frenulum

secures the tongue to

the floor of the mouth


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Dorsum of the tongue

The dorsum of thetongue is divided into

Palatine part, the anterior

2/3, it is rough due to

lingual papillae.

Pharyngeal part,

posterior 1/3, it is smooth

and nodular.

Sulcus terminalis is a v

shaped sulcus, at its apex

lie foramen caecum.


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Muscles of the tongue

Extrinsic muscles;

Genioglossus

Hyoglossus

Styloglossus

palatoglossus.


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Muscles of the tongue

Intrinsic muscles;

Longitudinal.

Transverse.

Vertical.


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Blood supply

Arterial supply

Lingual.

Tonsillar.

Ascending pharyngeal.

Venous drainage.

Lingual veins.

Profunda lingue.

Lingual vein.


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Nerve supply

Motor

Hypoglossal nerve; all

intrinsic and extrinsicmuscles.

Except palatpglossus

by pharyngeal plexus .


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20 Oral Cavity

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