Following is not an external manifestation of enamel: (A) Enamel tufts, (B) Enamel lamella, (C) Incremental lines of enamel, (D) Enamel cuticle
Answer is A. Perikymata are transverse, wave like grooves, believed to be the external manifestations of Incremental Lines of Retzius. Enamel cuticle is a delicate membrane that covers the entire enamel of the crown of a newly erupted tooth but is probably soon removed after mastication. Enamel lamellae are thin leaf like structures that extend from the enamel surface towards DEJ.