Ectoderm lining the primitive mouth gives rise to two horseshoe bands of thickened epithelium called:

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The ectoderm lining the primitive mouth gives rise to the dental lamina, which is a horseshoe-shaped thickened epithelium that forms on both the upper and lower jaws. The dental lamina gives rise to the tooth buds, which eventually develop into the teeth. Enamel papilla and dental papilla are formed from other layers of cells during tooth development, and enamel lamina is not a known structure.

Ectoderm Lining the Primitive Mouth Gives Rise to Two Horseshoe