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51 Cards in this Set
- Front
- Back
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What forms between frontal prominence & cardiac bulge?
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Stomatodeum
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What separates stomatodeum from foregut?
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Buccopharyngeal membrane
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Buccopharyngeal membrane formed of what two layers?
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Ectoderm & endoderm
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Neural crests cells derive from?
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Neuroectoderm
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Ectomesenchyme derives from?
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Neural crest cells
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Epithelial bands form in area where what will form?
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Dental arches
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Thickening of epithelial band & formation of ridge of cells projecting into ectomesenchyme known as?
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Dental lamina
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General lamina gives rise to what other lamina?
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1. Lateral lamina
2. Succesional lamina 3. Vestibular lamina |
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Lateral lamina gives rise to?
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Deciious teeth & molars
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Successional lamina gives rise to?
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Permanent successional teeth (anteriors & premolars)
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Dental lamina forms?
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Epithelial enamel organs of developing teeth
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Vestibular lamina forms?
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oral vestibule
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What happens during bud stage? (2)
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1. Bud develops-- dental lamina starting to form enamel organ
2. Surrounding ectomesenchyme proliferates |
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Basal membrane is intact during bud stage?
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Yes
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What happens during cap stage? (2)
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1. Epithelial enamel organ becomes concave
2. Enamel knot & cord appear |
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Enamel knot & cord present in which teeth?
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Molars (at cap stage)
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What is histodifferentiation?
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Ameloblasts & odontoblasts acquire their phenotypes
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What is morphodifferentiation?
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Tooth shape determined
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Stellate reticulum forms due to?
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glycosaminoglycans
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What surrounds outer enamel epithelium cells?
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Basal lamina
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Outer enamel epithelial cells are linked by?
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Junctional complexes
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How are stellate reticular cells connected to each other, outer enamel epithelium & stratum intermedium?
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Hemidesmosomes
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Organelles of stellate reticular cells are?
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Sparse
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Stratum intermedium cells are connected to neighboring layers by?
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desmosomes
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Which cells contain tonofilaments?
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Stratum intermedium cells & inner enamel epithelial cells
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Which cells of the enamel organ have high glycogen content?
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Inner enamel epithelial cells
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Dental papilla is separated from enamel organ by?
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basal lamina
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what type of cells form dental papilla
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undifferentiated mesenchymal cells
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When the first calcified tissue appears in the cusp region of the tooth the dental papilla becomes?
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Pulp
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What is found in the peripheral area around the developing tooth?
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Dental follicle
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What distinguishes dental follicle from dental papilla?
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Dental follicle has larger number of collagen fibrils
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Why does fragmentation of dental lamina occur?
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Separation of developing tooth from oral epithelium
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If fragmentation of dental lamina doesn't occur & cells persist, what will form? (4)
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1. Epithelial pearls
2. Eruption cysts 3. Odontomes 4. Supernumerary teeth |
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Primary dentition initiated between which weeks of development?
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6-8 weeks of development
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Successional permanent teeth initiated when?
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20th week (in utero) - 10 months (after birth)
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Permanent molars initiated when?
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20th week (in utero) - 5 yrs
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Ameloblast differentiation occurs where?
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From inner enamel epithelium starting at cusp region
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What induces odontoblast differentiation?
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Ameloblasts
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Where does odontoblast differentiation occur?
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From ectomesenchymal cells in dental papilla
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Enamel formation begins when?
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First formed dentin causes ameloblasts to begin forming enamel
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When does dental lamina begin to degenerate?
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During reciprocal induction
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Prior to hard tissue formation where does vascular exist? (2)
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1. Dental papilla
2. Dental follicle |
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After hard tissue formation vascularture exists where?
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Dental follicle only
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Why does stellate reticulum collapse?
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Brings follicular blood supply closer to ameloblasts
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When is root development initiated?
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After crown is complete
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What is required for induction of root odontoblasts?
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Hertwig's epithelial root sheath
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Hertwig's epithelial root sheath proliferates from?
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Cervical loop
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When induction of odontoblasts in root is complete, root sheath cells migrate away from root & break up to form cell clusters called?
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Epithelial rests
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Following break of root sheath what happens?
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Cementoblasts differentiate from ectomesenchymal cells of follicle & deposit cementum
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What cells produce perdiodontal ligmanet?
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Fibroblasts
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Cementoblasts, osteoblasts & fibroblasts all develop from?
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ectomesenchyme of dental follicle
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