Introduction:
At about 6 weeks of age, the primitive oral cavity or the stomodeum develops. It is
lined by the oral ectoderm (it is a stratified squamous epithelium) with connective
tissue beneath, often referred to as ectomesenchyme. The ectomesenchyme
originates from neural crest cells which are ectodermal initially and later become
mesodermal.
โ The oral ectoderm contacts the endoderm of the foregut to form the
buccopharyngeal membrane. at about 27th day of gestation this membrane
ruptures and the primitive oral cavity establishes a connection to the foregut.
At about 6th week oral ectoderm proliferate more rapidly then adjust cells.
This leads to formation of the horseshoe-shape primary epithelial band in the
location of future dental arches.
At about 7th week the primary epithelial band divides into:
1. Inner lingual process called dental lamina
2. Outer buccal process called vestibular lamina
Dental Lamina โ primordial
for ectoderm portion of
deciduous teeth
Vestibular Latina โ oral
vestibule between alveolar
portion of jaws and the lips I
cheeks
Future
Dental lamina is towards the inner side and the
one on the outer side is the vestibular lamina.
Vestibular lamina is also called the lip furrow band
as it separates the lips and the teeth.
As the lamina continues to grow deep in the
connective tissue, the cells also undergo
degeneration to form a furrow.
The dental lamina shows increased cell growth in
certain positions forming a localised thickening called
enamel organ.
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