Illustrated Dental Embryology Histology and Anatomy 4th Edition Test Bank
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Below:
Chapter 04: Face and
Neck Development
MULTIPLE CHOICE
1.
The medial nasal
processes are involved directly in the formation of the
embryo’s _____ of the nose during prenatal development.
|
a.
|
bridge
|
|
b.
|
sides
|
|
c.
|
bridge and sides
|
|
d.
|
nasal placodes
|
ANS: A
The medial nasal
processes refer to the middle part of the tissue growing around the nasal
placodes, and they appear as two crescent-shaped swellings located between the
nasal pits. In the future, the medial nasal processes will fuse together
externally to form the middle part of the nose from the root of the nose,
including the bridge of the nose, to the apex of the nose, as well as the
tubercle of the upper lip and philtrum.
REF:
Chapter 4, Nose and Paranasal Sinus Formation, Page 36
2.
The philtrum of the
upper lip forms during sixth week of prenatal development from the:
|
a.
|
mandibular processes.
|
|
b.
|
medial nasal processes.
|
|
c.
|
lateral nasal processes.
|
|
d.
|
nasal placodes.
|
ANS: B
During the start of
the sixth week of prenatal development, the upper lip begins formation when
each maxillary process fuses with each medial nasal process on both sides of
the stomodeum. Thus, the maxillary processes contribute to the sides of the
upper lip, and the two medial nasal processes contribute to the philtrum.
REF:
Chapter 4, Upper and Lower Lip Formation, Page 37
3.
The mandibular arch
during the embryonic period of prenatal development is the:
|
a.
|
fusion of the two paired
mandibular processes.
|
|
b.
|
swelling found superior to the
stomodeum.
|
|
c.
|
structure that gives rise to the
lateral nasal process.
|
|
d.
|
posterior part of the hard palate.
|
ANS: A
The paired mandibular
processes then fuse at the midline to form the mandibular arch, the
developmental form of the future lower dental arch, the mandible. After fusion,
the mandibular arch then extends as a band of tissue found inferior to the
stomodeum and between the developing brain and heart.
REF:
Chapter 4, Mandibular Arch and Lower Face Formation, Page 34
4.
A type of cleft lip
can result during prenatal development from the lack of fusion between _____
processes.
|
a.
|
mandibular and maxillary
|
|
b.
|
medial nasal and maxillary
|
|
c.
|
lateral nasal and medial nasal
|
|
d.
|
two lateral nasal
|
|
e.
|
lateral nasal and maxillary
|
ANS: B
Failure of fusion of
the maxillary process with the medial nasal process can result in cleft lip,
with varying degrees of disfigurement and disability present in the upper lip.
REF:
Chapter 4, Clinical Considerations for Upper Lip Development, Page 37
5.
In which week of
prenatal development does facial development begin in the embryo?
|
a.
|
Second
|
|
b.
|
Fourth
|
|
c.
|
Fifth
|
|
d.
|
Eighth
|
ANS: B
The face and its
associated tissue begin to form during the fourth week of prenatal development
within the embryonic period.
REF:
Chapter 4, Facial Development, Page 32
6.
Which of the following
facial structures is formed from the mandibular arch during prenatal
development?
|
a.
|
Forehead
|
|
b.
|
Lower face
|
|
c.
|
Philtrum
|
|
d.
|
Nose
|
ANS: B
In the future, the
mandibular arch directly gives rise to the lower face, including the lower lip.
The mandibular arch will also give rise not only to the mandible, but
additionally to its mandibular teeth and associated tissue.
REF:
Chapter 4, Mandibular Arch and Lower Face Formation, Page 34
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