Deck 17: Integumentary System

Question 1

________ Fused layers of enamel epithelia

A)Tetracyclines
B)Ameloblastic layer
C)Hair follicles
D)Neural crest cells
E)Epithelial root sheath of the developing tooth

Answer 1

E
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 2

________ Inner enamel epithelium

A)Dental pulp
B)Predentin
C)Dental sac
D)Enamel
E)Cement

Answer 2

D
Cells of the inner enamel epithelium adjacent to the dentin differentiate into ameloblasts.These cells produce enamel in the form of prisms (rods)and deposit it over the dentin.

Question 3

________ Sebaceous glands

A)Tetracyclines
B)Ameloblastic layer
C)Hair follicles
D)Neural crest cells
E)Epithelial root sheath of the developing tooth

Answer 3

C
Most sebaceous glands arise as buds from the sides of the epithelial root sheaths of hair follicles,late in the second trimester of pregnancy.A few sebaceous glands develop from the epidermis,independently of hair follicles (e.g.,in the eyelids and labia minora).

Question 4

________ Odontoblasts

A)Dental pulp
B)Predentin
C)Dental sac
D)Enamel
E)Cement

Question 5

________ Derived from the neural plate

A)Tetracyclines
B)Ameloblastic layer
C)Hair follicles
D)Neural crest cells
E)Epithelial root sheath of the developing tooth

Question 6

________ Bud of the permanent tooth

A)A
B)B
C)C
D)D
E)E

Question 7

________ Melanocytes

A)Tetracyclines
B)Ameloblastic layer
C)Hair follicles
D)Neural crest cells
E)Epithelial root sheath of the developing tooth

Question 8

________ Dental sac

A)A
B)B
C)C
D)D
E)E

Question 9

________ Derived from the inner enamel epithelium

A)Tetracyclines
B)Ameloblastic layer
C)Hair follicles
D)Neural crest cells
E)Epithelial root sheath of the developing tooth

Question 10

________ Induction of the odontoblastic layer

A)Tetracyclines
B)Ameloblastic layer
C)Hair follicles
D)Neural crest cells
E)Epithelial root sheath of the developing tooth

Question 11

________ Inner enamel epithelium

A)A
B)B
C)C
D)D
E)E

Question 12

________ Lanugo

A)Tetracyclines
B)Ameloblastic layer
C)Hair follicles
D)Neural crest cells
E)Epithelial root sheath of the developing tooth

Question 13

________ Part of the enamel organ

A)A
B)B
C)C
D)D
E)E

Question 14

________ Dental papilla

A)A
B)B
C)C
D)D
E)E

Question 15

________ Dental lamina

A)A
B)B
C)C
D)D
E)E

Question 16

________ Discoloration of teeth

A)Tetracyclines
B)Ameloblastic layer
C)Hair follicles
D)Neural crest cells
E)Epithelial root sheath of the developing tooth

Question 17

________ Periodontal ligament

A)Dental pulp
B)Predentin
C)Dental sac
D)Enamel
E)Cement

Question 18

________ Ameloblasts

A)Dental pulp
B)Predentin
C)Dental sac
D)Enamel
E)Cement

Question 19

________ Contains vessels and nerves

A)Dental pulp
B)Predentin
C)Dental sac
D)Enamel
E)Cement

Question 20

________ Inner cells of the dental sac

A)Dental pulp
B)Predentin
C)Dental sac
D)Enamel
E)Cement