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Biol 1410 > Early Development > Flashcards

Early Development Flashcards

1
Q

Zygote

A

diploid. under go rapid mitotic divisions (cleavage divisions)

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2
Q

Stages of pre embryonic period

A

zygote, morula, blastocyst

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3
Q

Morula

A

solid ball of 16-32 cells called blastomeres

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4
Q

Blastocyst features:

A
  • fluid filled cavity (blastocoel)
  • inner cell mass
  • trophoblast
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5
Q

Inner cell mass

A

cells will divide and differentiate to form the embryo

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6
Q

Trophoblast

A

cells will divide and differentiate to form chorion

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7
Q

Chorion

A

derived from trophoblast cells. provides nutrients to developing embryo

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8
Q

Implantation

A

blastocyst moves from uterine tube and attaches to endometrium of uterine wall

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9
Q

After implantation inner cell mass forms a..

A

1-layered (bilayered) embryonic disc

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10
Q

Embryonic disc is composed of:

A

Epiblast and hypoblast

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11
Q

Epiblast undergoes mitosis to form:

A
  • amnion (fluid filled amniotic cavity)

- 3 germ layers of the embryo

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12
Q

Hypoblast undergoes mitosis to form:

A

yolk sac

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13
Q

3 germs layers forming embryo

A

ectoderm, mesoderm, endoderm

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14
Q

Ectoderm

A

(top) will form the nervous system and the epidermis of the skin

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15
Q

Mesoderm

A

(middle)will form muscles, cardiovascular system, dermis, and most bones

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16
Q

Endoderm

A

will form epithelial linings of digestive, respiratory, urinary and reproductive systems and their associated glands

17
Q

During embryonic period what happens

A
  • major organ systems almost completely formed
  • heart begins to beat
  • limb buds differentiate
  • embryonic membranes form
18
Q

Embryonic membranes

A

Chorion, amnion, yolk sac, allantois

19
Q

Amnion

A

derived from epiblast. forms amniotic cavity which surrounds embryo/fetus with amnion fluid

20
Q

Yolk sac

A

derived from hypoblast. forms part of gut, produces earliest blood cells, source of reproductive cells

21
Q

Allantois

A

out pocket of yolk sac, forms umbilical cord and urinary bladder

Biol 1410 (17 decks)

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