Development Of Teeth

Front 1

Ganglionic crest, a band of ectodermal cells that appear along either side of the embyonic neural tube at the time of closure.

Back 1

neural crest cells

Front 2

Horseshoe-shaped epithelial bands that traverse the upper and lower jaws and give rise to the ectodermal portions of the teeth.

Back 2

dental lamina

Front 3

That portion of the dental lamina lingual to the developing deciduous teeth, which gives rise to the enamel organs of permanent teeth.

Back 3

successional lamina

Front 4

Initial stage of tooth development; the enamel organ develops from this structure. The dental papilla lies adjacent to the epithelial bud, and the dental sac encloses both.

Back 4

bud stage

Front 5

Part of tooth development; an early stage in enamel organ formation following the bud stage.

Back 5

cap stage

Front 6

Part of the formative organ of the teeth that forms the dentin and the pulp.

Back 6

dental papilla

Front 7

Area of mesenchymal cells and fibers that surround the dental papilla and the enamel organ of the developing teeth. It produces the periodontal ligament, alveolar bone, and cementum.

Back 7

dental sac (follicle)

Front 8

Developmental stage of the tooth characterized by the differentiation of inner enamel epithelial cells into ameoblasts and the formation of the outline of the future crown by these cells.

Back 8

bell stage

Front 9

Cells that cover the enamel organ.

Back 9

outer enamel epithelial cells

Front 10

Cells that line the concavity of the enamel organ in the cap and early bell stages of tooth development and differentiate into ameloblasts.

Back 10

inner enamel epithelium

Front 11

One of the differentiated cells of the inner layer of the enamel organ; from these cells comes the enamel of the teeth.

Back 11

Ameloblasts

Front 12

A network of star-shaped cells in the center of the enamel organ between the outer and inner enamel epithelia.

Back 12

stellate reticulum cells

Front 13

Epithelial cell layer of the enamel organ that lies external and adjacent to the inner enamel epithelium and is attached to it by desmones. Also refers to the intermediate layer of nonkeratinized epithelia.

Back 13

stratum intermedium cells

Front 14

One of a layer of columnar cells with long processes extending into the dentinal tubules and lining the peripheral pulp of a tooth. These cells function in dentin formation and vitalize this tissue.

Back 14

odontoblasts

Front 15

Band of newly formed, and as yet unmineralized, matrix of dentin located at the pulpal border of the dentin.

Back 15

predentin

Front 16

Yellowish body of the tooth. It surrounds the pulp and underlies the enamel on the crown and the cementum on the roots of the teeth. Composed of 20% organic matrix, which is mostly collagen, and 10% water. The inorganic fraction (70%) is hydroxyapatite, with some carbonate, magnesium, and flouride.

Back 16

dentin

Front 17

A system of effectors, modulators, and receptors through which cells interact.

Back 17

cell signaling

Front 18

The soft tissue contained within the pulp chamber. Consists of connective tissue, blood vessels, nerves, and lymphatics.

Back 18

dental pulp

Front 19

A cytoplasmic extension of the cell body of the odontoblasts, some of which extend from the cell as far as the dentinoenamel junction or the cementoenamel junction.

Back 19

odontoblastic process

Front 20

Specialized apical zone of the ameloblasts. ______ process is conical and interdigitates with the forming enamel rods.

Back 20

Tomes' process

Front 21

Localized condensations of cytoplasmic substance associated with the cell membrane of the apical area of the functional ameloblast.

Back 21

terminal bar apparatus

Front 22

Cell junction. It consists of a dense plate near the cell surface that relates to a similar structure on an adjacent cell, between which are thin layers of extracellular material.

Back 22

desmosomes

Front 23

Protein found in newly deposited enamel matrix. Amelogenins are lost during maturation of enamel.

Back 23

amelogenin

Front 24

The organic protein component of enamel.

Back 24

enamelin

Front 25

A thin film on the enamel surface of an unerupted tooth. It is the product of the degenerating ameloblasts.

Back 25

primary cuticle

Front 26

Half of a desmosome that forms a site of attachment between epithelial cells and the basal lamina or between epithelial cells (junctional cells) and the tooth's surface.

Back 26

hemidesmosome

Front 27

Stage of plaque formation and attachment.

Back 27

protective stage

Front 28

The layers of the epithelial enamel organ compacted and remaining on the surface of enamel after its formation is complete.

Back 28

reduced enamel epithelium

Front 29

Cervical loop enamel organ cells that proliferate, forming a double layer of cells that function in root formation.

Back 29

epithelial root sheath/
Hertwig's root sheath

Front 30

A deposition by the epithelial root sheath cells on the root surface formed during root formation. May be termed enameloid.

Back 30

intermediate cementum