1003 Flashcards

1
Q

Gametogenesis

A

1st week

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2
Q

Fertilization

A

1st week

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3
Q

Implantation

A

One week after fertilization

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4
Q

Development of CNS

A

3rd week

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5
Q

Embryonic folding

A

4th week

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6
Q

Bilaminar and trilaminar discs should be present before

A

Embryonic folding

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7
Q

Whatisitcalledwhentheblastocystattachestotheliningof the uterus?
• A. Ovulation
• B. Mitosis
• C. Implantation
• D. Fertilization

A

C

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8
Q

Human embryology’’ is the science concerned with the origin and development of a human being from:
• A-birthtopubertyB-spermandovumtozygoteC-azygotetobirthofan infant D- 6th week to birth

A

C

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9
Q

When does the implantation process begin and end?
• A-Fertilizationto8thweekB-Beginningofweek2tillthe12thdayC-12th day to birth D- Fertilization to the end of the first week

A

B

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10
Q

Epiblast layer is adjacent to ……….
• A-AmnioticcavityB-posteriorsurfaceoftheuterusC-YolkcavityD-
Cortex of the ovary

A

A

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11
Q

Where does the spermatogenesis occur?
• A-CortexofOvaryB-EndometriumC-EpididymisD-Seminiferoustubules

A

D

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12
Q

Spermcannotfertilizeanegguntilthey
A) Lose their acrosome.
B) Undergo capacitation.
C) Are activated by nurse cells of the vagina. D) Are in the vagina for 3 days.

A

B

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13
Q

What is the time of formation of all primary oocytes?
A. 4th week of embryonic life
B. 5th month of fetal life
C. At birth
D. 5th month of infancy
E. in adolescence

A

B

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14
Q

Duringgastrulation,
• A)Definiteorgansbegintoappear.
• B)Theplacentaisformed.
• C)Theblastodiscisformed.
• D)Germlayersareformed.
• E)Cellsfromthehypoblastmovetotheepiblast.

A

D

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15
Q

Where does the sperm capacitation process take place?

A

Capacitation

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16
Q

What is the embryonic origin of the epidermis and dermis?

A

Ectoderm and mesoderm

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17
Q

Which of the following events in oogenesis takes place immediately after the completion of the 2nd meiosis?

A Degeneration of the zona pellucida
B Corona radiata binding to sperm
C Formation of female ponucleus
D Blastocyst appearance
E Completion of the division

A

C

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18
Q

Which stage of the development of the ovarian follicle is characterized by the initial period of the first follicular fluid accumulation?
A) Graafian follicle B) Mature follicle
C) Primordial follicle D) Oocyte
E) Secondary follicle

A

E

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19
Q

Which of the following is the first stage of meiosis in which primary oocytes wait until puberty?
A) Interphase
B) Prophase
C) Metaphase D) Anaphase E) Telophase

A

B

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20
Q

Where sperm is produced…
A) Vesicle seminalis B) Ductus deferens C) Epididymis
D) Prostate
E) Seminiferous tubule

A

E

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21
Q

What is the estimated number of primary oocytes in a healthy pubertal woman?

A

400000

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22
Q

Most common site of fertilization?

A

Ampulla

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23
Q

What is the site of implantation?

A

Uterine wall1 uterus

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24
Q

Where is the most common area of ectopic implantation?

A

-Tuba uterina

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25
Q

Which mass will develop the embryo in the blastocyst?

A

• Embryoblast will develop the embryo in the blastocyst

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26
Q

Which mass will be included in the placental structure in the blastocyst?

A

Trophoblast

27
Q

Invasive cell that allows the blastocyst to be embedded in the endometrium by dissolving the endometrial stroma?

A

-Synstyotrophoblast

28
Q

Which participates in bilaminar germ disc formation
I. Hypoblast II. Epiblast
III. Amnioblast

29
Q

Which cell participates in the formation of the Heuser membrane?
a) Embryoblast b) Hypoblast
c) Epiblast
d) Trophoblast
e) Cytotrophoblast

30
Q

What happens during the gastrulation period?
Epiblast development
Primitive streak
Notachord formation

31
Q

How soon after fertilization does implantation take place?
A. By 12 hours
B. By 30 hours
C. Day3
D. Day4
E. Day6

32
Q

Which two embryological structures together form the bilaminar disk?
A. Cytotrophoblast and Hypoblast
B. Hypoblast and Epiblast
C. Epiblast and Cytotrophoblast
D. Syncytiotrophoblast and Inner cell mass
E. Epiblast and Embryoblast

33
Q

The amniotic cavity forms during the process of implantation of the blastocyst. The amniotic cavity forms within which of the following structures?
A. Epiblast
B. Cytotrophoblast
C. Syncytiotrophoblast
D. Maternal endometrium
E. Hypoblast

34
Q

The notochord develops from which of the following embryonic germ layers?
A. Endoderm
B. Ectoderm
C. Mesoderm
D. Neuroectoderm
E. Neural crest cells

35
Q

Neural crest cells develop during a process known as neurulation. These cells can ultimately form which of the following?
A. Melanocytes
B. Lymphocytes
C. Somites
D. All of the above

36
Q

Somites form from which of the following embryological derivations?
A. Paraxial mesoderm
B. Lateral plate mesoderm
C. Neural crest cells
D. Endoderm
E. Ectoderm

37
Q

In a growing embryo, the vertebrae encase notochord and neural tube in a solid bone like structure. Vertebrae are formed from which of the following embryological structures?
I. Dermatomes II. Myotomes
III. Sclerotomes

38
Q

The nucleus pulposus is the embryological remnant of which of the following?
A. Neural plate
B. Neural tube
C. Neural crest cells
D. Sclerotomes
E. Notochord

39
Q

The part of the sperm containing proteolytic enzymes to digest the zona pellucida is?

40
Q

During the second week of development the trophoblast differentiates into…

A

cytotrophoblast, syncytiotrophoblast

41
Q

Which structure is not observed in the second week of embryonic development?
A. Amniotic cavity
B. Yolc sac
C. Neural plate Develops in 3rd week
D. Connecting stalk

42
Q

What are the approximate days of the beginning of uteroplacental circulation?

A

11-12 DAYS Uteroplacental circulation begings to develop during the second week

43
Q

What is the main event of the 3rd week of development?

A

The main event of the 3rd week is gastrulation: formation of 3 germ layers
-Endoderm
-Mesoderm
-Ectoderm

44
Q

Which cell type induces the formation of the primitive streak?

A

Epiblast cells

45
Q

1) Which of the following statements is true?
A) Corpus albicans is transformed into corpus luteum
B) Primary oocytes undergo first and second meiosis during prenatal life
C) Ovulated secondary oocyte is captured by fimbriae of the uterine tube
D) Corpus luteum of pregnancy is degenerated within a week.
E) Primordial germ cells are originated from the endodermal layer of
amniotic cavity.

46
Q

2)Which of the following structures possesses corona radiata?
A) Mature Graafian follicle
B) Early primary follicle
C) Late primary follicle
D) Corpus luteum
E) Corpus albicans

47
Q

Which of the following statements is true?
A) Corpus albicans is transformed into corpus luteum
B) Primary oocytes undergo first and second meiosis during prenatal
life
C) Ovulated secondary oocyte is captured by fimbriae of the uterine
tube
D) Corpus luteum of pregnancy is degenerated within a week.
E) Primordial germ cells are originated from the endodermal layer of
amniotic cavity.

48
Q

Which of the following structures possesses corona radiata?
A) Mature Graafian follicle
B) Early primary follicle
C) Late primary follicle
D) Corpus luteum
E) Corpus albicans

49
Q

When does the implantation begins and end?
A) Fertilization to 8th week
B) Begining of the week till the 12 th day
C) 12 th day to the birth
D) Fertilization to the first week

50
Q

Where does the spermatogenesis occur?
A)Endometrium
B) Semineferous tubules
C) Ovary
D) Amniotic cavity
E) Yolk cavity

51
Q

Which of the following provides an important induction for the formation of neural plate?
A) Epiblast
B) Notochord
C) Yolk sac
D) Heuser’s membrane
E) Allantois

52
Q

Concerning the somites, which of the following is responsible for the
development of skeletal muscle ?
A) Sclerotome
B) Myotome
C) Dermatome
D) Lateral mesoderm
E) Intermediate mesoderm

53
Q

Fill in the blank: Concerning the oogenesis, in which stage cellular division of
primary oocyte is arrested ?
A) Interphase
B) Metaphase of first meiosis
C) Prophase of first meiosis
D) Anaphase of second meiosis
E) Prophase of second meiosis

54
Q

What is the female gametogenesis period name?
A) Oogenesis
B) Spermatogenesis
C) Bilaminar germ disc

55
Q

What is the main process formation of third week?
A) Oogenesis
B) Spermatogenesis
C) Trilaminar germ disc
D) Notochord
E) Primordial germ cell

56
Q

Where is the embryo implantation area?
A)Endometrium of uterus
B) Fallop tube

57
Q

What is the main process formation of second week?
A) Oogenesis
B) Spermatogenesis
C) Bilaminar germ disc
D) Notochord
E) Primordial germ cell

58
Q

What is the order at which the following are
developed?
Embryo -> Blastocyst -> Morula -> Zygote
Zygote -> Blastocyst -> Morula -> Embryo
Zygote -> Morula -> Blastocyst -> Embryo
Morula -> Blastocyst -> Zygote -> Embryo

59
Q

When is the critical period at which primordial
of all organ systems are established?
Embryonic period - weeks 3-8
Embryonic period - weeks 9-38
Fetal period - weeks 3-8
Fetal period - weeks 9-38

60
Q

The first two intraembryonic germ
layers to differentiate are the:
ectoderm & hypoblast
epiblast & hypoblast
ectoderm & endoderm
ectoderm & mesoderm

61
Q

The yolk sac in the human embryo:
does not contribute to the embryonic gut
is devoid of hemopoietic activity, or blood cell
formation
is the site of primordial germ cell production
stores nutrients throughout pregnancy

62
Q

Teratomas are:
the product of teratogens
malformed fetuses
a type of tumor containing tissue from all
germ layers
derived from trophoblast
none of the above

63
Q

What process converts the bilaminar disc
into the trilaminar embryonic disc consisting
of ectoderm, mesoderm, and endoderm?
somitogenesis
transformation
gastrulation
neurulation

A

Gastrulation

64
Q

What process converts the bilaminar disc
into the trilaminar embryonic disc consisting
of ectoderm, mesoderm, and endoderm?
somitogenesis
transformation
gastrulation
neurulation

A

Gastrulation