Dental Histology Hardest Exam: Quiz!

he vestibular lamina (A) and dental lamina (B) seen at the 7th week of intra-uterine life.

the primary epithelial band divides into two processes: a
buccally located vestibular lamina and a lingually situated dental
lamina.
• The vestibular lamina contributes to the development of the vestibule
of the mouth, delineating the lips and cheeks from the tooth-bearing
regions. Cells of the vestibular lamina proliferate, with subsequent
degeneration of the central epithelial cells to produce the sulcus of
the vestibule.

1- Dentoalveolar crest fibres
2-Horizontal fibres
3-Oblique fibres
4-Apical fibres
5-Interradicular fibres
Fig 12.9: Orientation of the principle fibres of the periodontal ligament

Section of circumvallate papilla (A). Serous glands (B) of von Ebner empty via ducts
into the base of the trench (C) surrounding the papilla, which is not raised above the surface
of the tongue. D = muscle of tongue.

An erupting tooth (A) about to emerge into the oral cavity through an
epithelium-lined pathway as a result of fusion of the oral epithelium (B) and the reduced
enamel epithelium (C) D = enamel space

Section of skin of lip. A = keratinized epidermis; B = shaft of hair; C = sebaceous
gland; D = dermis.

Section of the masticatory keratinized epithelium (A) of the hard palate. Note the
highly folded interface with the lamina propria (B).

The dental pulp is a loose connective tissue and
made up of a combination of cells embedded in an
extracellular matrix of fibres in a semi-fluid gel.
• Cells of pulp include odontoblasts, fibroblasts, stem
cells, defense cells like lymphocytes, dendritic
antigen presenting cells etc.
• It contains 75% water and 25% organic material by
weight

A = basal layer (single cell layer, cuboidal cells, stem cells originate here that generate "transit-amplifying cells that give rise to replacement keratinocytes")
B = prickle cell layer (above basal cell layer, round or ovoid, desmosomes increase in # and become more obvious than basal)
C = granular layer (increased in maturation, cells are larger and flatter contain keratohyaline granules w/ filaggrin that binds keratin filaments together into a stable network)
D = keratinized layer (final stage of maturation, loss of all organelles, autolysis due to proteases. Filled entirely with tonofilaments surrounded by matrix protein filaggrin)