Tooth development and dental anatomy: germ layer origin of the tooth germ: practice question

A Dentistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dentistry · Tooth development and dental anatomy: germ layer origin of the tooth germ

Sample item

During odontogenesis, which pairing of tissue and embryonic origin is correct?

AEnamel organ from oral ectoderm, dental papilla from neural crest ectomesenchymeBEnamel organ and dental papilla both from oral ectodermCEnamel organ from neural crest, dental papilla from oral ectodermDEnamel organ from endoderm, dental papilla from mesoderm only

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Enamel organ from oral ectoderm, dental papilla from neural crest ectomesenchyme

Oral epithelium (ectoderm) gives rise to the enamel organ, which forms enamel. The dental papilla is neural crest ectomesenchyme and forms dentine and pulp.

Option by option

A. Enamel organ from oral ectoderm, dental papilla from neural crest ectomesenchyme (correct)
Correct. Epithelial enamel organ and ectomesenchymal papilla interact reciprocally to form the tooth.
B. Enamel organ and dental papilla both from oral ectoderm
The papilla is mesenchymal in character, not epithelial.
C. Enamel organ from neural crest, dental papilla from oral ectoderm
This reverses the two origins.
D. Enamel organ from endoderm, dental papilla from mesoderm only
The oral cavity lining that gives the dental lamina is ectodermal, not endodermal.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is A, Enamel organ from oral ectoderm, dental papilla from neural crest ectomesenchyme. Oral epithelium (ectoderm) gives rise to the enamel organ, which forms enamel.

Why is "Enamel organ and dental papilla both from oral ectoderm" not the answer?

The papilla is mesenchymal in character, not epithelial.

Why is "Enamel organ from neural crest, dental papilla from oral ectoderm" not the answer?

This reverses the two origins.

Why is "Enamel organ from endoderm, dental papilla from mesoderm only" not the answer?

The oral cavity lining that gives the dental lamina is ectodermal, not endodermal.

What concept does this question test?

It tests Tooth development and dental anatomy: germ layer origin of the tooth germ in Dentistry. The dental papilla is neural crest ectomesenchyme and forms dentine and pulp.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Tooth development and dental anatomy: germ layer origin of the tooth germ?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.