Anatomic Science Quiz 2

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Question 1 of 20

1. Question

Cleidocranial dysplasia – radiographic finding

An 8-year-old girl presents with open cranial sutures, short stature, frontal bossing, and the ability to approximate her shoulders in front of her chest due to hypoplastic clavicles. Intra-orally she has a narrow, high-arched palate. Which panoramic finding best fits this condition?

Numerous osteomas of the jaws
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Multiple odontogenic keratocysts
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Several central giant cell granulomas
Correct Incorrect Correct answer

Many unerupted and supernumerary teeth
Correct Incorrect Correct answer

Correct

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Question 2 of 20

2. Question

Intranatal calcification of primary teeth

Calcification of primary tooth crowns first begins during which approximate time in intrauterine life?

2nd month in utero
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3rd month in utero
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6th month in utero
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Shortly after birth
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Question 3 of 20

3. Question

Lower versus upper facial height

In a normally proportioned face, what is the approximate relationship of lower facial height (subnasale to menton) to upper facial height (glabella to subnasale)?

Lower 40% : Upper 60%
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Lower 45% : Upper 55%
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Lower 55% : Upper 45%
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Lower 50% : Upper 50%
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Question 4 of 20

4. Question

Mental foramen in the primary dentition

Relative to the primary teeth, the mental foramen is most likely to be located:

Just mesial to the primary canine
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Between the primary canine and first molar
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Between the primary first and second molars
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Distal to the primary second molar
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Question 5 of 20

5. Question

Facial nerve lesion at the stylomastoid foramen

A lesion of the facial nerve just as it exits the stylomastoid foramen will primarily result in loss of which function?

Tear secretion from the lacrimal gland
Correct Incorrect Correct answer

Taste from the anterior two-thirds of the tongue
Correct Incorrect Correct answer

Motor control of the stapedius muscle
Correct Incorrect Correct answer

Motor innervation to the posterior belly of the digastric muscle
Correct Incorrect Correct answer

Correct

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Question 6 of 20

6. Question

Basement membrane composition

The basal lamina of most epithelia is rich in which type of collagen?

Type I
Correct Incorrect Correct answer

Type II
Correct Incorrect Correct answer

Type III
Correct Incorrect Correct answer

Type IV
Correct Incorrect Correct answer

Correct

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Question 7 of 20

7. Question

Hunter–Schreger bands

While preparing a full-coverage crown on a mandibular molar, you notice certain areas of enamel offer unusual resistance to cutting burs, especially near cuspal tips. This is most likely due to:

Perikymata on the enamel surface
Correct Incorrect Correct answer

Cross striations of enamel prisms
Correct Incorrect Correct answer

Hypocalcified Striae of Retzius
Correct Incorrect Correct answer

Hunter–Schreger bands and associated gnarled enamel
Correct Incorrect Correct answer

Correct

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Question 8 of 20

8. Question

Surface manifestations of Striae of Retzius

Fine horizontal grooves seen on the enamel surface of newly erupted teeth, corresponding to the ends of Striae of Retzius, are called:

Imbrication lines
Correct Incorrect Correct answer

Cross striations
Correct Incorrect Correct answer

Perikymata
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Incremental lines of von Ebner
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Correct

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Question 9 of 20

9. Question

Daily versus periodic enamel growth lines

Which statement best differentiates cross striations from Striae of Retzius in enamel?

Cross striations and Striae of Retzius both represent weekly growth lines
Correct Incorrect Correct answer

Cross striations are daily growth lines; Striae of Retzius represent longer-period increments
Correct Incorrect Correct answer

Striae of Retzius are daily increments; cross striations represent stress lines only
Correct Incorrect Correct answer

Cross striations occur only near cuspal tips, whereas Striae of Retzius are confined to cervical enamel
Correct Incorrect Correct answer

Correct

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Question 10 of 20

10. Question

Dental anomaly – “extra crown, normal root count”

A patient appears to have four maxillary central incisor crowns, yet radiograph shows only two roots in this region. Which developmental anomaly best explains this?

Fusion
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Gemination
Correct Incorrect Correct answer

Dilaceration
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Dens invaginatus
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Question 11 of 20

11. Question

Shared feature of primary and permanent dentition

Which characteristic is common to both primary and permanent canines?

Presence of mamelons on the incisal edge
Correct Incorrect Correct answer

Greater crown convexity in primary canines
Correct Incorrect Correct answer

Longer distofacial cusp ridge than mesiofacial cusp ridge on mandibular canines
Correct Incorrect Correct answer

Longer distofacial cusp ridge than mesiofacial cusp ridge on maxillary canines
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Question 12 of 20

12. Question

Collagen type in dentin

Which type of collagen predominates in mature dentin?

Type I
Correct Incorrect Correct answer

Type II
Correct Incorrect Correct answer

Type III
Correct Incorrect Correct answer

Type IV
Correct Incorrect Correct answer

Correct

Incorrect
Question 13 of 20

13. Question

Odontoblast processes in dentinal tubules

What is the usual extent of odontoblastic processes within dentinal tubules?

They extend the full length of the tubules to the DEJ
Correct Incorrect Correct answer

They extend from pulp to approximately one-third to halfway toward the DEJ
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They are confined to the predentin only
Correct Incorrect Correct answer

They are present only in secondary dentin
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Correct

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Question 14 of 20

14. Question

Nasal sinus anatomy

Which paranasal sinus is located directly inferior to the orbits?

Frontal sinus
Correct Incorrect Correct answer

Ethmoid air cells
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Sphenoid sinus
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Maxillary sinus
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Question 15 of 20

15. Question

Location of palatine tonsils

The palatine tonsils are situated between which two muscular folds in the oropharynx?

Styloglossus and stylopharyngeus folds
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Palatoglossal and palatopharyngeal folds
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Palatoglossal and styloglossus folds
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Palatopharyngeal and stylopharyngeal folds
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Question 16 of 20

16. Question

TMJ disc – vascularity and innervation

Which region of the temporomandibular joint articular disc is avascular and aneural?

Anterior band
Correct Incorrect Correct answer

Central (intermediate) zone
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Posterior band
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Lateral border
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Question 17 of 20

17. Question

Pharyngeal arch derivatives – trigeminal nerve

The mandibular division of the trigeminal nerve (V3) is primarily associated with derivatives of which pharyngeal arch?

First arch
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Second arch
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Third arch
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Fourth arch
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Question 18 of 20

18. Question

Gnarled enamel – clinical implication

Which clinical situation is most directly influenced by the presence of gnarled enamel at cusp tips?

Increased susceptibility to enamel caries
Correct Incorrect Correct answer

Difficulty detecting periapical lesions radiographically
Correct Incorrect Correct answer

Greater resistance of cuspal enamel to fracture and cutting during tooth preparation
Correct Incorrect Correct answer

Increased permeability of enamel to bleaching agents
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Correct

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Question 19 of 20

19. Question

Developmental biology – timing of reduction division

Which statement best describes “reduction division” in gametogenesis?

It occurs during the first mitotic division of a somatic cell
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It occurs during the second mitotic division of a somatic cell
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It occurs during the first meiotic division of germ cells
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It occurs during the second meiotic division of germ cells
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Question 20 of 20

20. Question

Type of cell division – relevance to growth

Which of the following cells in oral tissues is normally capable of undergoing mitosis in the adult?

Mature skeletal muscle fibers
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Odontoblasts lining the pulp
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Basal cells of oral stratified squamous epithelium
Correct Incorrect Correct answer

Neurons of the trigeminal ganglion
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Anatomic Science Quiz 2

Quiz Summary

Information

Results

Results

Categories

1. Question

Cleidocranial dysplasia – radiographic finding

2. Question

Intranatal calcification of primary teeth

3. Question

Lower versus upper facial height

4. Question

Mental foramen in the primary dentition

5. Question

Facial nerve lesion at the stylomastoid foramen

6. Question

Basement membrane composition

7. Question

Hunter–Schreger bands

8. Question

Surface manifestations of Striae of Retzius

9. Question

Daily versus periodic enamel growth lines

10. Question

Dental anomaly – “extra crown, normal root count”

11. Question

Shared feature of primary and permanent dentition

12. Question

Collagen type in dentin

13. Question

Odontoblast processes in dentinal tubules

14. Question

Nasal sinus anatomy

15. Question

Location of palatine tonsils

16. Question

TMJ disc – vascularity and innervation

17. Question

Pharyngeal arch derivatives – trigeminal nerve

18. Question

Gnarled enamel – clinical implication

19. Question

Developmental biology – timing of reduction division

20. Question

Type of cell division – relevance to growth