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5t 5t 5t 5t 5t


Modern Dental Assisting 14th Edition
5t 5t 5t 5t



Editors5t:
Jeffrey5tR.5tSmith5t&5tDebbie5tS.5tRobinson

,Chapter5t1.5tOral5tEmbryology5tand5tHistology



1. Which5tof5tthe5tfollowing5tis5tthe5tprocess5tby5twhich5tthe5tcells5tof5tthe5tfertilized5tegg5tdiv
ide5tand5tform5ta5tball5tof5tcells5tduring5tembryonic5tdevelopment?
A. Cleavage
B. Differentiation
C. Organogenesis
D. Implantation
Answer:5tA.5tCleavage
Rationale:5tCleavage5tis5tthe5tseries5tof5trapid5tmitotic5tdivisions5tthat5toccur5tafter5tfertilizat
ion,5tleading5tto5tthe5tformation5tof5ta5tball5tof5tcells5tknown5tas5tthe5tmorula.
DIF:5tEasy
TOP:5tEmbryonic5tdevelopmen
t5tMSC:5tMultiple5tChoice
2. During5tthe5tfirst5tweek5tof5tembryonic5tdevelopment,5tthe5tfertilized5tegg5tbecomes5ta5tstr
ucture5tcalled5ta:
A. Zygote
B. Blastocyst
C. Morula
D. Embryo
Answer:5tB.5tBlastocyst
Rationale:5tAfter5tfertilization5tand5tcleavage,5tthe5tball5tof5tcells5t(morula)5tforms5tinto5ta5tb
lastocyst,5twhich5timplants5tinto5tthe5tuterine5twall.
DIF:5tEasy
TOP:5tEmbryonic5tdevelopmen
t5tMSC:5tMultiple5tChoice
3. The5toral5tcavity5tbegins5tto5tdevelop5tduring5twhich5tof5tthe5tfollowing5tstages5tof5temb
ryonic5tdevelopment?
A. Zygote
B. Fetal
C. Pre-implantation
D. Embryonic
Answer:5tD.5tEmbryonic
Rationale:5tThe5tdevelopment5tof5tthe5toral5tcavity5tstarts5tduring5tthe5tembryonic5tstage,5tar
ound5tthe5tthird5tweek5tof5tpregnancy,5tas5tthe5tfacial5tstructures5tbegin5tto5tform.
DIF:5tModerate
TOP:5tOral5tcavity5tdevelopmen
t5tMSC:5tMultiple5tChoice
4. The5tprocess5tby5twhich5tthe5tneural5ttube5tforms5tand5tbegins5tto5tdevelop5tinto5tthe5tbra
in5tand5tspinal5tcord5tis5tknown5tas:
A. Gastrulation
B. Neurulation
C. Cleavage
D. Organogenesis

, Answer:5tB.5tNeurulation
Rationale:5tNeurulation5tis5tthe5tprocess5twhere5tthe5tneural5ttube5tforms,5twhich5tlater5tgive
s5trise5tto5tthe5tcentral5tnervous5tsystem5t(brain5tand5tspinal5tcord).
DIF:5tModerate
TOP:5tNeural5tdevelopment5tM
SC:5tMultiple5tChoice
5. Which5tof5tthe5tfollowing5tis5tthe5tprimary5tfunction5tof5tthe5tmesoderm5tlayer5tin5temb
ryonic5tdevelopment?
A. Formation5tof5tthe5tnervous5tsystem
B. Development5tof5tthe5tskin5tand5thair
C. Formation5tof5tmuscles,5tbones,5tand5tcirculatory5tsystems
D. Formation5tof5tthe5tdigestive5tsystem
Answer:5tC.5tFormation5tof5tmuscles,5tbones,5tand5tcirculatory5tsystems
Rationale:5tThe5tmesoderm5tlayer5tgives5trise5tto5tstructures5tsuch5tas5tmuscles,5tbones,5tand5tthe5t
circulatory5tsystem5tduring5tembryonic5tdevelopment.
DIF:5tModerate5tTO
P:5tGerm5tlayers
MSC:5tMultiple5tChoice
6. The5tterm5t"histology"5trefers5tto5tthe5tstudy5tof:
A. The5tstructure5tand5tfunction5tof5ttissues
B. The5tdevelopment5tof5torgans
C. The5tstructure5tof5tcells
D. The5tdevelopment5tof5tembryos
Answer:5tA.5tThe5tstructure5tand5tfunction5tof5ttissues
Rationale:5tHistology5tis5tthe5tstudy5tof5ttissues,5tincluding5ttheir5tstructure5tand5tfunction,5ta
nd5ttheir5trole5tin5tthe5tbody.
DIF:5tEasy5 t T
OP:5tHistology
MSC:5tMultiple5tChoice
7. The5tenamel5tof5tthe5ttooth5tis5tderived5tfrom5twhich5tembryonic5ttissue?
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Neural5tcrest
Answer:5tA.5tEctoderm
Rationale:5tEnamel,5tthe5thard5touter5tsurface5tof5tthe5ttooth,5tdevelops5tfrom5tthe5tectoderm
al5tlayer5tof5tthe5tembryo.
DIF:5tModerate
TOP:5tTooth5tdevelopment5tMS
C:5tMultiple5tChoice
8. The5tdevelopment5tof5tthe5tface5tand5toral5tcavity5tduring5tembryonic5tdevelopment5tinv
olves5tfusion5tof5twhich5tstructures?
A. Palatal5tshelves
B. Maxillary5tand5tmandibular5tprocesses
C. Frontal5tnasal5tprocess
D. Both5tB5tand5tC

, Answer:5tD.5tBoth5tB5tand5tC
Rationale:5tThe5tdevelopment5tof5tthe5tface5tand5toral5tcavity5tinvolves5tthe5tfusion5tof5tthe5t
maxillary5tand5tmandibular5tprocesses,5tas5twell5tas5tthe5tfrontal5tnasal5tprocess.
DIF:5tModerate
TOP:5tFacial5tdevelopment5tMS
C:5tMultiple5tChoice
9. Which5tstructure5tis5tresponsible5tfor5tthe5tformation5tof5tthe5tteeth5tduring5tembr
yonic5tdevelopment?
A. Neural5tcrest
B. Ectoderm
C. Mesoderm
D. Endoderm
Answer:5tA.5tNeural5tcrest
Rationale:5tThe5tneural5tcrest5tcells5tplay5ta5tcrucial5trole5tin5tthe5tformation5tof5tthe5tteeth5tduring
5tembryonic5tdevelopment.
DIF:5tModerate
TOP:5tTooth5tformatio
n5tMSC:5tMultiple5tCh
oice
10. The5tfirst5tindication5tof5ttooth5tdevelopment5toccurs5tduring5twhich5tweek5tof5tembr
yonic5tdevelopment?
A. 2nd5tweek
B. 5th5tweek
C. 6th5tweek
D. 7th5tweek
Answer:5tC.5t6th5tweek
Rationale:5tThe5tfirst5tindication5tof5ttooth5tdevelopment5tappears5tduring5tthe5t6th5tweek5tof
5tembryonic5tdevelopment,5twhen5tthe5tdental5tlamina5tforms.
DIF:5tModerate
TOP:5tTooth5tdevelopment5tMS
C:5tMultiple5tChoice
11. The5tprocess5tof5tossification5trefers5tto:
A. The5tformation5tof5tblood5tcells
B. The5tformation5tof5tbone
C. The5tdevelopment5tof5tthe5tskin
D. The5tdevelopment5tof5tthe5tdigestive5tsystem
Answer:5tB.5tThe5tformation5tof5tbone
Rationale:5tOssification5tis5tthe5tprocess5tby5twhich5tbone5ttissue5tis5tformed5tfrom5tcartilag
e5tor5tother5tconnective5ttissue.
DIF:5tModerate
TOP:5tBone5tdevelopment5
tMSC:5tMultiple5tChoice
12. Which5tof5tthe5tfollowing5tis5ta5tkey5tfeature5tof5tthe5thistological5tstructure5tof5tenamel?
A. It5tis5tcomposed5tof5tcollagen5tfibers
B. It5tis5tavascular5tand5thas5tno5tliving5tcells
C. It5tcontains5tmany5tblood5tvessels
D. It5thas5ta5thigh5tcontent5tof5twater