Oral Histology and Embryology Review

Posted on Oct 23, 2024 in Biology

Myoepithelial Cells

1. They are derived from mesenchymal cells.

Saliva Production and Characteristics

2. Parasympathetic action produces a denser saliva.

Enamel Organ

3. The matrix is composed of proteins, glycoproteins, and collagen.

Oral Mucosa Keratinization

4. Merkel cells are located in the middle strata.

Minor Salivary Glands

5. The ducts are abundant.

Dental Pulp

6. Adult pulps contain large quantities of fat.

Cementum Composition

7. The matrix is composed of collagen fibers, elastic fibers, and amorphous substance.

Periodontal Attachment

8. Dentogingival fibers are the smallest group.

Odontogenesis

9. The stellate reticulum secretes dental enamel.

Major Salivary Glands

10. The parotid and sublingual glands have connective tissue septa that separate them completely.

Glandular Parenchyma

11. The gland possesses branched excretory ducts.

Facial Development

12. Endothelium is derived from mesoderm and oral mucosa.

Tongue Development

13. Dental papillae appear in the fifteenth week.

Head Skeleton Development

14. The cartilaginous stage is called the chondrocranium.

Development Alterations

15. Hypovitaminosis A impairs facial formation.

Enamel

16. Enamel porosity is characterized by micropores ranging from 0.7 to 4.5 nm.

Enamel Etching Patterns

17. The employed etching determines the restoration’s retention.

Dentin

18. Tertiary dentin is deposited at the periphery of the dentinal tubule.

Dentinal Complex Functions

19. Protection.

Ameloblast Life Cycle

20. Posteruptive stage.

Root Formation

1. The free end of the epithelial diaphragm grows inside the connective tissue papilla.

Temporomandibular Joint

2. The articular disc has five distinguishable areas.

Alveolar Process

3. Fibrous bone is represented by 70% collagen.

Clinical Alveolar Bone Projections

4. Adult bone has high plasticity.

Gingival Epithelium

5. The oral epithelium is 60% keratinized.

Tooth-Epithelium Interface

6. Cementum has an afibrillar collagen matrix.

Dentoepithelial Union Levels

7. Fifth state.

Odontogenesis

8. The performative membrane is the boundary between enamel and cementum.

29. Regarding tooth formation:

  • Dentin calcification occurs in globular areas.
  • Enamel lacks regenerative capacity.
  • Dental pulp originates from the dental papilla.

30. Regarding Merkel cells of the oral mucosa:

  • These cells are associated with nerve fibers.

31. Regarding Langerhans cells of the oral epithelium:

  • They have high mobility and can migrate from and return to the epithelium.

32. Incorrect statement regarding gingival epithelium morphology:

  • The dento-epithelial junction is formed by type 1 collagen fibers called anchoring fibers.

33. Regarding dental pulp:

  • Reticular fibers are found throughout the pulp but are abundant in early odontogenesis.
  • The presence of fibronectin around blood vessels in the odontoblast layer contributes to the affinity between fibronectin and collagen.

34. Regarding enamel:

  • Enamel prism plumes are a rare disorder, and their image is due to their crossing.
  • Enamel lamellae are cracks that may extend into the dentin.

35. Regarding teeth:

  • The clinical crown is limited by the sulcus.
  • Dentin has a lower organic content than bone.
  • Dentin contains collagen III, but in a lower percentage than bone.

36. Regarding lining mucosa:

  • The braces are true runners that together form dense epithelium and chorion.
  • Taste buds can also be located in the soft palate, epiglottis, and glossopalatine arches.

37. Regarding cementum:

  • Afibrillar cementum may be present on enamel, sometimes on the concrete, and sometimes fibrillar.
  • Areas of higher cementum calcification called hypercementosis can occur.
  • Cellular fibrillar cementum is present in the apical half of the root.

38. Regarding the lips:

  • The surface cells of their free edge contain eleidin.

39. Regarding dentin:

  • The organic part contains, among other components, phosphoproteins, proteins with a carboxyglutamic acid range, lipids, and glycogen.

40. Regarding the pulp-dentin complex:

  • Fast, sharp, and precise pain fibers are large myelinated fibers.
  • Slow, dull, and fuzzy pain fibers are thin myelinated fibers.
  • A polypeptide called substance P is found in the nerve fibers and endings of the subodontoblastic plexus.