# Which of the following structures is not of ectodermal origin?
A. Hunter Schreger bands
B. Enamel spindles
C. Enamel tufts
D. Enamel lamellae
The correct answer is B. Enamel spindles.
Enamel spindles are odontoblastic processes, which extend into enamel. Enamel spindles are mesenchymal in origin.
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