Question 1

________ Discoloration of teeth

Accepted Answer

Tetracyclines (a group of antibiotics) can cause discoloration of teeth when given during tooth development.

Question 2

________ Bud of the permanent tooth

Accepted Answer

The answer of  ________ Bud of the permanent tooth
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Question 3

________ Inner cells of the dental sac

Accepted Answer

The inner cells of the dental sac differentiate into cementoblasts,which produce cement (L.cementum)and deposit it over the dentin of the root.

Question 4

________ Induction of the odontoblastic layer

Accepted Answer

The ameloblastic layer induces the mesenchymal cells in the dental papilla adjacent to the inner enamel epithelium to differentiate into odontoblasts.If there is a deficiency of vitamin A,the ameloblasts do not differentiate properly.Consequently,there is abnormal formation of odontoblasts.

Question 5

________ Derived from the inner enamel epithelium

Accepted Answer

The ameloblastic layer is derived from the inner enamel epithelium during tooth development. Tetracyclines are a type of antibiotic that can affect tooth development, but they are not directly derived from the inner enamel epithelium. Hair follicles and neural crest cells are not involved in tooth development. The epithelial root sheath of the developing tooth is derived from the dental follicle, which surrounds the developing tooth bud.

Question 6

________ Part of the enamel organ

Accepted Answer

The structure highlighted in the image is the enamel organ of a developing tooth. Among the labeled structures, only structure C, known as the inner enamel epithelium, is a component of the enamel organ. The other structures, including A (dental papilla), B (dental sac), D (outer enamel epithelium), and E (stellate reticulum), are also associated with tooth development but are not part of the enamel organ.

Question 7

________ Dental sac

Accepted Answer

The answer of  ________ Dental sac
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Question 8

________ Fused layers of enamel epithelia

Accepted Answer

The inner and outer enamel epithelia of the enamel organ come together and fuse in the neck region of the tooth,where they form the epithelial root sheath.This sheath grows into the mesenchyme and initiates root formation.

Question 9

________ Derived from the neural plate

Accepted Answer

Neural crest cells are specifically derived from the neural plate during embryonic development. Tetracyclines are a type of antibiotic and have no relation to the neural plate. The ameloblastic layer and epithelial root sheath are both associated with tooth development, but do not originate from the neural plate. Hair follicles are derived from the ectoderm.

Question 10

________ Sebaceous glands

Accepted Answer

Sebaceous glands are associated with hair follicles.

Question 11

________ Lanugo

Accepted Answer

Lanugo is fine downy hair that covers the skin of the fetus and is shed before or shortly after birth. It develops from hair follicles.

Note: The other choices are not related to lanugo. Tetracyclines are a type of antibiotic, the ameloblastic layer is involved in tooth development, neural crest cells give rise to various tissues including the nervous system, and the epithelial root sheath of the developing tooth is involved in root formation.

Question 12

________ Dental papilla

Accepted Answer

The answer of  ________ Dental papilla
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Question 13

________ Melanocytes

Accepted Answer

Melanocytes are derived from neural crest cells during embryonic development.

Question 14

________ Dental lamina

Accepted Answer

The dental lamina is a band of thickened epithelium in the mouth that gives rise to the tooth buds. In the image, A represents the dental lamina. B, C, D, and E are structures that develop from the tooth buds.

Question 15

________ Inner enamel epithelium

Accepted Answer

The answer of  ________ Inner enamel epithelium
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Quiz 1: Gametogenesis and Fertilization