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Lecture

Lab 8. Oral Cavity.doc


Department
Anatomy & Cell Biology
Course Code
ANAT 261
Professor
Jason Young

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Lab 8: Oral Cavity
Oral cavity: non-keratinized stratified squamous epithelium
Erupted tooth
1. Clinical crown:
-consists of enamel and dentin
oWon’t see enamel in lab!
-above gingiva (gums)
2. Anatomical crown:
- clinical crown + gingiva
-continues until point where enamel layer
ends
-Gingiva = parakeratinized stratified
squamous epithelium (makes gum
tough and resistant)
3. Root and associated structures:
-Root:
oPulp: loose CT, blood vessels, lymphatics, nerves
oOdontoblasts: line pulp & secrete dentin (as pre-
dentin….stains pale pink)
Columnar shape, nuclei at base
oDentin: has lined appearance from cannaliculi (stains
darker pink)
oCementum: runs down outside edge of dentin
Secreted by cementocytes
-Associated with the root:
operiodontal ligament: connects cementum to alveolar
bone
fibrous dense irregular CT
oapical foramen: opening @ bottom of root (allows nerves,
lymphatics & BVs to enter pulp)
oalveolar bone: forms a socket where the tooth rests
Unerupted (developing) tooth
[Innermost to outermost]
1. Developing pulp
2. Odontoblasts
3. Predentin and dentin
4. Enamel
5. Enamel organ: forms enamel
-Inner Dental Epithelium (IDE)
oAmeloblasts = tall columnar cells
-Stratum Intermedium
o1-3 polygonal cell layers
-Stellate Reticulum
o“star shaped”; lots of intercellular space
-Outer Dental Epithelium (ODE)
**IDE and ODE
merge at the root
sheath!!
*Mucogingival junction
=
parakeratin disappears
and epithelium becomes
non-keratinized oral
mucosa (continues to
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