Transcript ORAL CAVITY - mbbsclub.com

ORAL CAVITY
Oral cavity consists of the mouth and its
structures, which include the tongue,
teeth and their supporting structures
(periodontium), major and minor
salivary glands, and tonsils.
Divided into vestibule and oral cavity
proper.
MUCOSA
• A mucous tissue
lining various tubular
structures consisting
of epithelium, lamina
propria, and, in the
digestive tract, a
layer of smooth
muscle (muscularis
mucosae).
MUCOSA OF ORAL CAVITY
Masticatory mucosa
• Has a keratinized
and parakeratinized
stratified squamous
epithelium
• Found in gums and
hard palate
Lining mucosa
• Non keratinized
epithelium
• Few papillae
• Found on lips,
cheeks,floor of oral
cavity
Specialized mucosa
• Associated with
taste sensation
• Restricted to dorsal
surface of tongue
LIPS
Cutaneous area
Red area
Oral mucosa
CHEEKS
Skin with sebaceous and sweat glands
Mucosa lined by Stratified squamous non
cornified epithelium
Lamina propria is compact, contain
papilla and connected by a submucosa to
the underlying skeletal muscle.
Submucosa has elastic fibers and
tubuloalveolar glands
GUMS
Epithelium
Lamina propria
No submucosa
and no glands
HARD PALATE
Epithelium keratinized
Long vascular papillae
Periosteum of the hard
palate
Submucosa with
collagen fibers and gland
SOFT PALATE
Oral surface
Pharyngeal surface
Mucosa
Submucosa
Glands
Skeletal muscles
TONGUE
The main bulk of the tongue, particularly of
the anterior two-thirds, is skeletal muscle.
The interlacing muscle fibers course chiefly in
three directions, longitudinally, transversely,
and vertically, an arrangement which gives
maximal mobility and physical control.
LOWER SURFACE
Stratified squamous
noncornified
epithelium
Lamina propria is
thin and closely
bound to underlying
muscle.
DORSAL SURFACE
Anterior 2/3:
Lingual papillae
Posterior 1/3:
Mucosal ridges
and lingual tonsils
No submucosa
FILIFORM PAPILLAE
Most numerous
Smallest
Evenly distributed
Slender core of
vascular epithelium
Stratified squamous
epithelium
Secondary projections
FUNGIFORM
PAPILLAE
Few in number
Interspersed among
the filiform papillae
Rounded summits
and broader bases
Noncornified
epithelium
Highly vascular
connective tissue
1.STRATIFIED SQUAMOUS NONCORNIFIED
EPITHELIUM
2.LAMINA PROPRIA
3.TASTE BUD
FOLIATE PAPILLAE
Along the posterolateral border of the tongue
there are folds of the mucous membrane,
sometimes called the foliate papillae.
Not well developed in humans.
In some animals,e.g.,rabbits, it constitute
the principle site of aggregation of taste
buds.
CIRCUMVALLATE
PAPILLAE
9-12 in number
Resemble fungiform
papillae
Much larger
Surrounded by a trench
and a wall
Small oval bodies, taste
buds
TASTE BUDS
TASTE SENSES
DORSAL SURFACE OF
THE POSTERIOR THIRD
OF THE TONGUE
Free of papillae
Has mucosal
ridges and
lingual tonsils
ANATOMICAL DIVISION
Crown
Root
Neck
COMPONENTS OF TOOTH
Enamel
Dentin
Cementum
Pulp
ENAMEL
• Consists of
Enamel rods
Inter rod enamel
• Secreted by
ameloblasts
• At apical pole-----Tomes process
• At the base--------cluster of mitochondria
ENAMEL
Acellular mineralized
tissue that covers the
crown of tooth
Hardest substance in the
body
Once formed, can't be
replaced
96-98% exist mainly
as hydroxyapatite
crystals
DENTIN
• Calcified tissue
harder than bone
• Dentin is produced
by neural crest
derived odontoblasts
of the adjacent
mesenchyme
• Sensitive structure
PERIODONTIUM
•
•
•
•
Cementum
Alveolar bone proper
Periodontal ligament
Gingiva
PULP
A C.T. compartment
bounded by the tooth
dentin
Apical foramen
Vascular & neural
networks
Cavity decreases
with age