Embryology Flashcards

1
Q

Average Fetal age from conception to birth

A

38 weeks

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2
Q

Average Gestational age from conception to birth

A

40 weeks

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3
Q

During what period are all major organs formed?

A

embryonic (first 8 weeks)

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4
Q

During what period do all organs grow larger and become more complex?

A

fetal (last 30 weeks)

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5
Q

egg released into the peritoneal cavity

A

ovulation

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6
Q

occurs as egg travels down fallopian tube and meets sperm

A

fertilization

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7
Q

the cell that forms when the ova and sperm fuse

A

zygote

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8
Q

begins immediately as the zygote travels down the fallopian tube & into the uterus

A

cell division

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9
Q

the solid cluster of 12-16 blastomeres at about 72 hours

A

morula

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9
Q

On day 4 post conception, what does the 60 cell morula become when it enters the uterus and takes up fluid?

A

blastocyst

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9
Q

type of cell in blastocyst stage that forms the embryo

A

inner cell mass

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10
Q

layer of cells surrounding the cavity which helps form the placenta

A

trophoblast

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11
Q

What happens if inner cell mass of a single blastocyst divides?

A

monozygotic (identical) twins

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12
Q

two fluid filled sacs in the inner cell mass

A

Amniotic sac from epiblast

Yolk sac from hypoblast

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13
Q

will become the serous cavities of the ventral body cavity

A

coelem

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14
Q

period when MOST gross structural birth defects are induced

A

Weeks 3-8 (Organogenesis)

15
Q

When does the heart start pumping in the embryo?

A

29 days (one month)

16
Q

When does closure of the neural tube occur?

A

week 3-week 4

17
Q

lateral ectodermal cells, pulled along and form sensory nerve cells and other structures

A

neural crest

18
Q

Germ layer that becomes epidermis, hair, nails, glands of skin, brain, spinal cord, neural crest

A

ectoderm

19
Q

Germ layer that becomes intervertebral discs, trunk and limb musculature, vertebrae, ribs, kidneys, gonads, connective tissue, heart, blood vessels

A

mesoderm

20
Q

Germ layer that becomes epithelial lining and glands of digestive and respiratory tracts

A

endoderm