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Oral cavity, oral mucosa

Institute of Histology and Embryology

RNDr. Lucie Lantov, Ph.D. (lucie.lantova@lf1.cuni.cz)

Oral Histology and Embryology B81134

25.2. 2014

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ORAL CAVITY function

- ingestion- fragmentation- moistening

mastication (chewing) coordinated movements of the mandible, lips andtongue; cutting and grinding by teeth

structures of mouth tongue, teeth, major and minor salivary glands,

tonsils

PARTS vestibulebetween the lips, cheeks and teeth

oral cavity properbehind the teeth- bounded bysuperiorly hard, soft palates

inferiorlytongue, floor of the mouth

posteriorlyentrance to the pharynx

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ORAL MUCOSA lines oral cavity

function- protection (mechanical, infection)- sensation (temperature, touch, pain, taste)- secretion (saliva)

continuous with skin, but different- darker (vessels, thickness of the epithelium, keratinization)- no appendages (hair follicles, nails, sweat and sebaceous glands)

COMPONENTS1- stratified squamous epithelium2- lamina propria mucosae3- submucosa cheeks, lips, parts of hard palate

- loose fatty and glandular CT = flexible attachment3- OR mucoperiosteum gingiva, parts of hard palate

- mucosa attached to periosteum, no submucosa = firm attachment

TYPES

masticatory lining specialized

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ORAL MUCOSAMASTICATORY MUCOSA

location site of frictional and shearing stress gingiva, hard palate1- keratinized / parakeratinzed stratified squamous epithelium2- lamina propria

- thick papillary layer loose CT, blood vessels, nerves

- deep reticular layer more-dense CT, blends with periosteum3- submucosa (fatty and glandular zone of hard palate)3- OR mucoperiosteum (gingiva, hard palate raphe)

Ross, Pawlina 2011 HE

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ORAL MUCOSALINING MUCOSA

location lips, cheeks, alveolar mucosal surface, floor of the mouth, inferiorsurfaces of the tongue, soft palate

1- non-keratinized stratified squamous epithelium (vermilion borderkeratinized)- stratum basale- stratum spinosum- stratum superficiale

2- lamina propria fewer, shorter papillae; loose CT, blood vessels, nerves

3- submucosa (not in the inferior tongue surface)- bundles of collagen, elastic fibres bind submucosa to the underlying

muscle- minor salivary glands (lips, cheeks, tongue)- larger blood vessels, nerves, lymphatic vessels

SPECIALIZED MUCOSA sensation of taste dorsal surface of the tongue lingual papillae and taste buds

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PALATE

Ross, Pawlina 2011

HARD PALATE

bone keratinized (paraker.) stratified squamous epithelium (masticatory mucosa) mucoperiosteum (raphe, gingiva) submucosa

- fatty zone adipose tissue- glandular zone mucous glands

uvula

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PALATESOFT PALATE

skeletal muscle nasopharyngeal part

- pseudostratified columnarciliated epith. (respiratory),

seromucous glands in submucosa oropharyngeal part

- non-keratinized stratifiedsquamous epith. (lining mucosa),

mucous glands in submucosa

nasopharyngeal part

oropharyngeal partuvula

skeletal muscle

sceletal muscle

mucous glands

stratified squamous non-keratinized

pseudostratified columnar ciliated

AZAN HE

HE

Dp. Hist. Embr.