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72 Cards in this Set
- Front
- Back
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Morula
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collection of cell in the early stage of embryo development
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Embryoblast
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collection of cell at one end of the blastocyst that will form the embryo
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blastocyst
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early embyo cell
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tophoblast
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cells that surround the blastocyte
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what are the 2 types of cells in a blastocyte
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trophoblast and blastocyst
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pharyngeal arch separates what two structures
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stomatodeum and heart
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mandibular meets where
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midline
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maxillary arch meets
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fuse with the nasal process
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groove that separate maxillary process from lateral nasal process
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naso-optic groove
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groove separate the maxillary process from the medial nasal process
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bucconasal groove
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jaw processes are fused when
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38 day
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oral cavity is lined with
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ectoderm
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3 components of dental lamina
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invagination of epithelium
basement membrane ectomesenchyme from neural crest |
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ectomesenchyme origin is
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neural crest
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invagination of epithelium
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epithelium cells into the ectomesenchyme
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enamel is original cells are
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epithelium
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vestibular lamina
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develop from epithelial cell junction of the gingiva and the tissue of inner cheek
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dental lamina
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epithelial tissue that connects the developing tooth to the oral cavity
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control center is thought to start where and move to
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ectoderm and move to the enctomesenchyme
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Bud stage has 3 components
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bud of enamel epithelium
basement membrane condensation of ectomesenchyme |
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enamel organ derived from what type of cell
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epithelium
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dental papilla derived from what type of cell
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ectomesenchyme
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Dental follicle (sac) surrounds what and what cell type is the sac
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enamel organ and papilla
ectomesenchyme |
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What stage does stellate reticulum and dental papilla
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cap stage
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enamel knot in what stage
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cap stage
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name 6 structure in the cap stage
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dental lamina, enamel organ, dental papilla, dental follicle, enamel knot, vestibular lamina
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do the enamel knot divide
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no, gene trascription
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parts of the enamel organ in the cap stage
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IEE, OEE, enamel knot, stellate
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enamel organ will form
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enamel
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dental papilla will form
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dentin, pulp
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dental sac (follicle) will form
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cementum, PDL, alveolar bone
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3 components of the tooth germ
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dental sac
enamel organ dentin papilla |
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what is the marphodifferentiation in the Bell stage
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crown takes final shape
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what is the histodifferentiation in the bell stage
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ameloblast and odontoplast
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what epithelium tissue disappear in the bell stage
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dental lamina
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cell division continues where in the bell stage
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cervical loop
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At happens after cessation of mitosis at the bell stage
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differentiation
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which forms first dentin or enamel
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dentin
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where is the oldest dentin
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cusp tip
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enamel knot appears or disappear at the bell stage
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disappear
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OEE appear or disappear at bell stage
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disappear
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Two distinguishing factors about the bell stage
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cervical loop
dentin |
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cervical loop is the intersection b/w and what cell is not present
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intersection b/w IEE and OEE
stellate not present |
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What are the structures of the bud stage
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dental lamina
ectoderm ectomesenchyme |
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What are the structures of the cap stage
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Dental lamina, dental sac
stellate, enamel knot IEE, OEE |
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change in IEE before hard tissue formation
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elongation, differentiation, reverse polarity (nucleus move away from BM) secrete predentin
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odontoblast originate from
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ectomesenchyme <- neural crest
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IEE derived from
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ectoderm
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cementum and PDL derived from
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neural crest, mesenchyme
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dental sac derived from
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neural crest mesenchyme
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what cells form enamel
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stellate
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factors responsible for the differentiation of odontoblast
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TGF-B1, BMP-2 and IGF
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Odontoblast differentiate and produce
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dentin
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2 new structure at Bell stage
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cervical loop, dentin
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origin of odontoblast
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ectomesenchyme
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origin of IEE
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ectoderm
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origin of cermentum
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mesenchyme
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IEE cells morphogenetic change to ameloblast looks like
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low columnar, central nudlei
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odontoblast differentiate and produce
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dentin
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when odontoblast produce predentin what happens histodifferentiation to IEE
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reverse polarity
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Tome's process found where
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end of ameloblast
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Is the enamel secreted mineralized or not
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it is
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Does the first layer of enamel have rods and interrod
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no
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what happens to the enamel organ when the ameloblast secrete
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collaspes
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maturative ameloblast
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smooth end b/c protective ameloblast as part of the reduced enamel epithelium
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can enamel and dentin be regenerated after eruption
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enamel = no; dentin = yes
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What is the ultimate fate of dental lamina
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breaks down into discrete island of epithelial cell and can develop into cyst
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when cervical loop fuse IEE and OEEw/out stellate reticulum and stratum intermdium if forms
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Hertwigs Epithelial root sheath
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Hertwig epithelial root sheath is mesenchyme or ectodermal
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ectodermal
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radicular dentin is found where
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forming under Hertwig root sheath
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when the root sheath breaks down which cells differentiate
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cementoblast differentiate from dental sac to make cementum
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remnant of the root sheath becomes
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epithelial rest of malassez; can form a cyst or a tumor
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