NBDE PART 1- B&B-Oral HISTOLOGY
Questions and Answers
Oral cavity Mucosa - correct answers✅✅masticatory mucosa
lining mucosa
specialized mucosa
Mucosa (cross-section) - correct answers✅✅Stratified
Squamous Epithelium
Basement Membrane
Lamina Propia
*papillary layer (rete ridges/pegs)
*Thin submucosa
Parakeratinized epithelium - correct answers✅✅is similar to
keratinize epithelium but the cells of the stratum corneum their
nucleus, and their cytoplasm does not stain as intensely with
eosin
The depth and number of papillae is dependent on the relative
immobility of the masticatory mucosa. - correct
answers✅✅This protects it from frictional and shearing forces
lining Mucosa - correct answers✅✅This is on lips, cheeks,
alveolar mucosal surface, floor of mouth, ventral surfaces of the
tongue and soft palate
Non-Keratinized stratified squzmous (generally)
Thick submucosa
,NBDE PART 1- B&B-Oral HISTOLOGY
Questions and Answers
Layers of epithelum - correct answers✅✅Stratum basale
(germinativum)
Stratum epinosum
Stratum granulosum
Stratum corneum
Specialized cells in the epithelium - correct
answers✅✅keratinocytes
Langerhans cells (antigen-presenting immune cells)
Melanocytes
erkel's cell (sense or light touch)
Enamel - correct answers✅✅is the hardest most calcified
substance in the body
Striae of Retzius - correct answers✅✅Striations seen in the
enamel that represent rhythmic growth of the enamel. A more
pronounced striae called the neonatal line forms due to the
trauma of the birth. At the surface, the line of Retzius end as
series of parallel, shallow grooves called perykymata
Hunter-Schreger lines - correct answers✅✅Alternating light
and dark lines seen in enamel under light microscopy; they
represent areas of enamel rods cut in cross-sections dispersed
between areas of rods cut longitudinally.
,NBDE PART 1- B&B-Oral HISTOLOGY
Questions and Answers
Enamel tufts - correct answers✅✅Hypomineralized ribbon-like
structures that run longitudinally to the tooth axis and extend
from the dentino-enamel junction (DEJ) ib fifth to a third into the
enamel.
Enamel Spindles - correct answers✅✅Are odontoblasts
processes that extend into the enamel
Enamel lamellae - correct answers✅✅Are hypomineralized
enamel that extend either from the DEJ to the surface of the
enamel, or vice versa. They contain proteins, proteoglycans and
lipids
gnarled enamel - correct answers✅✅At the cusp tips and
incisal edges, variability in the direction of individual enamel rods
results in the formation of gnarled enamel.
Amelogenesis - correct answers✅✅begins after the start of
dentin formation.
Five stages in the life cycle of the ameloblast - correct
answers✅✅Life cycle of ameloblast
1-Morphongenic stage
2-Organizing
3-Formative
4-Maturative
5-Protective
, NBDE PART 1- B&B-Oral HISTOLOGY
Questions and Answers
6-Desmolytic
1- The inner enamel epithelium proliferates to form the basis
shape of the tooth. At the end of this stage they become post-
mitotic, terminallly differentiated cells called amelobalsts -
correct answers✅✅1-Morphogenic stage of Amelogenesis
2do stage of amelogenesis Organizing - correct
answers✅✅Ameloblast differentiation begin with the elongation
of the inner enamel epithelial cells, and a reorientation of their
intracellular organelles. As secretory pole is reoriented toward the
basement membrane, towards the DEJ. This process is called
repolarization.
3-Formative - correct answers✅✅Formation and mineralization
of mantle dentin form hydroxyapatite crystals
4-Maturative - correct answers✅✅responsible for the
continued mineralizatio of the enamel to it finally hardness,
approximately 96% mineral by weight
5-Protective - correct answers✅✅maturation competed and
ameloblast de-differentiate Enamel rod densely packed form
dentinoenamel junction , order 4-5 micrometers thick, elongated
crystals of hydroxyapatite ,
6-Desmolytic - correct answers✅✅remnants of stratum
intermedium and stellate reticulum and the ourte enamel
epithelium form the reduced enamel epitilium
Questions and Answers
Oral cavity Mucosa - correct answers✅✅masticatory mucosa
lining mucosa
specialized mucosa
Mucosa (cross-section) - correct answers✅✅Stratified
Squamous Epithelium
Basement Membrane
Lamina Propia
*papillary layer (rete ridges/pegs)
*Thin submucosa
Parakeratinized epithelium - correct answers✅✅is similar to
keratinize epithelium but the cells of the stratum corneum their
nucleus, and their cytoplasm does not stain as intensely with
eosin
The depth and number of papillae is dependent on the relative
immobility of the masticatory mucosa. - correct
answers✅✅This protects it from frictional and shearing forces
lining Mucosa - correct answers✅✅This is on lips, cheeks,
alveolar mucosal surface, floor of mouth, ventral surfaces of the
tongue and soft palate
Non-Keratinized stratified squzmous (generally)
Thick submucosa
,NBDE PART 1- B&B-Oral HISTOLOGY
Questions and Answers
Layers of epithelum - correct answers✅✅Stratum basale
(germinativum)
Stratum epinosum
Stratum granulosum
Stratum corneum
Specialized cells in the epithelium - correct
answers✅✅keratinocytes
Langerhans cells (antigen-presenting immune cells)
Melanocytes
erkel's cell (sense or light touch)
Enamel - correct answers✅✅is the hardest most calcified
substance in the body
Striae of Retzius - correct answers✅✅Striations seen in the
enamel that represent rhythmic growth of the enamel. A more
pronounced striae called the neonatal line forms due to the
trauma of the birth. At the surface, the line of Retzius end as
series of parallel, shallow grooves called perykymata
Hunter-Schreger lines - correct answers✅✅Alternating light
and dark lines seen in enamel under light microscopy; they
represent areas of enamel rods cut in cross-sections dispersed
between areas of rods cut longitudinally.
,NBDE PART 1- B&B-Oral HISTOLOGY
Questions and Answers
Enamel tufts - correct answers✅✅Hypomineralized ribbon-like
structures that run longitudinally to the tooth axis and extend
from the dentino-enamel junction (DEJ) ib fifth to a third into the
enamel.
Enamel Spindles - correct answers✅✅Are odontoblasts
processes that extend into the enamel
Enamel lamellae - correct answers✅✅Are hypomineralized
enamel that extend either from the DEJ to the surface of the
enamel, or vice versa. They contain proteins, proteoglycans and
lipids
gnarled enamel - correct answers✅✅At the cusp tips and
incisal edges, variability in the direction of individual enamel rods
results in the formation of gnarled enamel.
Amelogenesis - correct answers✅✅begins after the start of
dentin formation.
Five stages in the life cycle of the ameloblast - correct
answers✅✅Life cycle of ameloblast
1-Morphongenic stage
2-Organizing
3-Formative
4-Maturative
5-Protective
, NBDE PART 1- B&B-Oral HISTOLOGY
Questions and Answers
6-Desmolytic
1- The inner enamel epithelium proliferates to form the basis
shape of the tooth. At the end of this stage they become post-
mitotic, terminallly differentiated cells called amelobalsts -
correct answers✅✅1-Morphogenic stage of Amelogenesis
2do stage of amelogenesis Organizing - correct
answers✅✅Ameloblast differentiation begin with the elongation
of the inner enamel epithelial cells, and a reorientation of their
intracellular organelles. As secretory pole is reoriented toward the
basement membrane, towards the DEJ. This process is called
repolarization.
3-Formative - correct answers✅✅Formation and mineralization
of mantle dentin form hydroxyapatite crystals
4-Maturative - correct answers✅✅responsible for the
continued mineralizatio of the enamel to it finally hardness,
approximately 96% mineral by weight
5-Protective - correct answers✅✅maturation competed and
ameloblast de-differentiate Enamel rod densely packed form
dentinoenamel junction , order 4-5 micrometers thick, elongated
crystals of hydroxyapatite ,
6-Desmolytic - correct answers✅✅remnants of stratum
intermedium and stellate reticulum and the ourte enamel
epithelium form the reduced enamel epitilium
