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Dental Anatomy > DENT 1020 Oral Embryology (Ch. 3, 4, 5) > Flashcards

DENT 1020 Oral Embryology (Ch. 3, 4, 5) Flashcards

1
Q 
Which embryologic layer do the somites come from?
A) Ectoderm
B) Mesoderm
C) Endoderm
D) All of the above
A

B) Mesoderm

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2
Q 
Which cranial nerve innervates the fungiform papilla and is responsible for taste sensation?
A) Trigeminal (5)
B) Vagus (10)
C) Facial (7)
D) Glossopharyngeal (9)
A

C) Facial (7)

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3
Q 
The primitive streak is oriented in which direction?
A) Horizontal
B) Cephalic/Coronal
C) Midsagittal
D) Transverse
A

C) Midsagittal

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4
Q

Which of the following is true of meiosis?
A) It is a type of cell division that produces two identical daughter cells
B) It results in a diploid number of chromosomes
C) It occurs in reproductive organs
D) It results in cells with 46 chromosomes

A

C) It occurs in reproductive organs

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5
Q

Which of the following is the correct order from superior to inferior of the developing embryo in the bilaminar disk stage?
A) Amniotic, epiblast, hypoblast, yolk sac
B) Yolk sac, epiblast, hypoblast, amniotic
C) Amniotic, hypoblast, yolk sac, epiblast
D) Amniotic, epiblast, yolk sac, hypoblast

A

A) Amniotic, epiblast, hypoblast, yolk sac

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6
Q

TRUE or FALSE

The mandible forms in the 1st branchial arch.

A

True

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7
Q 
From which embryonic layer is mesoderm derived
A) Epiblast layer
B) Hypoblast layer
C) Endoderm
D) Neuroectoderm
A

A) Epiblast layer

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8
Q 
The first branchial GROOVE will eventually form which structure?
A) The auditory tube
B) The external auditory meatus
C) The middle ear bones
D) All of the above
A

B) The external auditory meatus

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9
Q 
Which nerve controls the movement of the intrinsic (internal) muscles of the tongue?
A) Trigeminal
B) Facial
C) Hypoglossal
D) Glossopharyngeal
E) Vagus
A

C) Hypoglossal

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10
Q 
Of the following events, which one comes first?
A) Beginning of tooth formation
B) Primary palate formation
C) Beginning of tongue formation
D) Secondary palate formation
A

C) Beginning of tongue formation

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11
Q 
The tubercle of the upper lip is formed from which embryologic process?
A) Medial nasal processes
B) Maxomandibular process
C) Mandibular
D) None of the above
A

A) Medial nasal processes

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12
Q 
During which week of prenatal development is the palate completed?
A) 5th
B) 8th
C) 10th
D) 12th
A

D) 12th

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13
Q

The primitive streak forms in the embryonic disk, causing:
A) Initiation of palatal development
B) Bilateral symmetry
C) Fusion of the mandibular processes
D) Disintegration of the oropharyngeal membrane
E) Creation of a second embryonic layer

A

B) Bilateral symmetry

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14
Q 
Which of the following pairs does NOT represent a true embryonic relationship?
A) Epiblast -> Ectoderm
B) Hypoblast -> Endoderm
C) Ectoderm -> Enamel
D) Hypoblast -> Mesenchyme
A

D) Hypoblast -> Mesenchyme

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15
Q 
After the embryonic disk folds into itself, it is shaped like a hollow tube. The inner part of the developing embryo will form the:
A) Stomodeum
B) Digestive tract
C) Frontal process
D) First branchial arch
E) Buccopharyngeal membrane
A

B) Digestive tract

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16
Q 
The stomodeum or "primitive mouth" of the embryo forms the:
A) Anterior portion of the tongue
B) Buccopharyngeal membrane
C) Nasal and oral cavities
D) Frontal process
E) Premaxilla
A

C) Nasal and oral cavities

17
Q 
Which of the following do the medial nasal processes NOT form?
A) Intermaxillary segment
B) Philtrum
C) Tubercle
D) Alae
E) None of the above
A

D) Alae

18
Q 
Cheeks are formed:
A) From the hypobranchial eminence
B) By fusion of the maxillary and mandibular processes
C) From the copula
D) From the tuberculum impar
A

B) By fusion of the maxillary and mandibular processes

19
Q

A common type of cleft lip can result from the lack of fusion between:
A) Mandibular and maxillary processes
B) Medial nasal and maxillary processes
C) Lateral nasal and medial nasal processes
D) Lateral nasal and maxillary processes

A

B) Medial nasal and maxillary processes

20
Q 
The mandible and most of the maxilla are formed by the:
A) Frontal process
B) Globular process
C) First branchial arch
D) Buccopharyngeal membrane
E) Second and third branchial arches
A

C) First branchial arch

21
Q 
Neural crest cells migrate from which embryonic structure(s)?
A) Stomodeum
B) First Branchial arch
C) Neural folds
D) Frontonasal process
E) Hypoblast layer
A

C) Neural folds

22
Q

The BODY of the tongue is formed mainly by the:
A) Central tubercle (tuberculum Impar) of the second branchial arch
B) Lateral lingual swellings (lateral tubercles) of the first branchial arch
C) Second, third, and fourth branchial arches
D) Second branchial arch only
E) third branchial arch only

A

B) Lateral lingual swellings (lateral tubercles) of the first branchial arch

23
Q

Which of the following phrases concerning the second branchial arch is correct?
A) It is called the mandibular arch
B) It contains Reichert’s cartilage
C) It forms into the muscles of mastication
D) It is associated with the trigeminal nerve

A

B) It contains Reichert’s cartilage

24
Q 
The thyroid gland has a common origin with the tongue, forming initially at the center of the 1st and 2nd branchial arches and then moving to its final position in the pharynx (throat). The depression left in the posterior part of the mature tongue where the thyroid gland formed is called:
A) Copula
B) Sulcus terminalis
C) Foramen cecum
D) Central tubercle
E) Thyroglossal duct
A

C) Foramen cecum

25
Q

TRUE or FALSE

The intermaxillary segment gives rise to the secondary palate.

A

False

26
Q

TRUE or FALSE
The triangular median swelling, the tuberculum impar, is formed from the fusion of mesenchyme from mainly the third and parts of the fourth branshial arches.

A

False

27
Q

The premaxilla contains tooth buds of the:
A) Incisors
B) Incisors and canines
C) Incisors, canines, and premolars
D) Incisors, canines, premolars, and molars

A

A) Incisors

28
Q 
Which of the following structures separates the stomodeum from the foregut?
A) Third arch cartilage
B) Cervical sinus
C) Reichert's cartilage
D) Meckel's cartilage
E) Buccopharyngeal membrane
A

E) Buccopharyngeal membrane

29
Q 
The first indication of tongue development is seen as a medial elevation known as the:
A) Copula
B) Tuberculum impar
C) Lingual notch
D) Sulcus terminalis
A

B) Tuberculum impar

30
Q

TRUE or FALSE

A cleft lip is more common and more severe in males, more commonly unilateral, and on the left side.

A

True

Dental Anatomy (7 decks)

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