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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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