highlights of fetal period Flashcards

1
Q

……….produces a large ventral
prominence and pumps
blood

A

The early heart

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2
Q

the
neural tube is open at
the rostral and caudal
…………….

A

neuropores

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3
Q

At 26 days, the ………….produces a
prominent elevation of the head and the
long, curved caudal eminence (tail-like
structure) is present.

A

forebrain

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4
Q

At 26 days, the ………. (primordia of
internal ears) are also visible.

A

otic pits

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5
Q

Ectodermal thickenings called …………., indicating the future lenses of
the eyes, are visible on the sides of the
head.

A

lens
placodes

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6
Q

At 28 days, which limb buds are
recognizable as small swellings on the
ventrolateral body walls?

A

upper limb buds

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7
Q

which structures are recognizable by the end of the fourth week?

A

-The fourth pair of pharyngeal arches and the lower limb buds
-the caudal neuropore is usually closed.
-cardiovascular system is established

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8
Q

when does the Growth of the head
exceeds that of other
regions?

A

during fifth week

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9
Q

The mesonephric ridges
indicate the site of the
mesonephric kidney
which are the primordia
of the permanent
kidneys during which week?

A

fifth week

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10
Q

when does the embryo show
reflex
responses to touch and spontaneous movements, such as
twitching of the trunk and limbs?

A

during Sixth Week

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11
Q

when do the digital rays(primordia of the digits (fingers)) —begin to develop in
the hand plates?

A

during Sixth Week

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12
Q

when do the —auricular
hillocks—develop and contribute to
the formation of the auricle of the
external ear?

A

during Sixth Week

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13
Q

when does the umbilical herniation occur?

A

during the sixth ween

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14
Q

Communication
between the primordial
gut and the umbilical
vesicle is
…………..

A

omphaloenteric duct.

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15
Q

when do Notches appear
between the digital rays
in the hand plates (to separate the future fingers)?

A

during the seventh week

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16
Q

when does the the scalp vascular plexus(skull) has
appeared and forms a
characteristic band around
the head?

A

during the eighth week

17
Q

Coordinated limb
movements first occur during which week

A

during the eighth week

18
Q

At the end of which week does the
embryo have visually distinct
human characteristics?

A

At the end of the eighth week

19
Q

The external genitalia of
males and females are not
fully developed until the
end of which week?

A

12th week.

20
Q

Urine formation begins
between the …………….
weeks, and urine is
discharged through the
urethra into the amniotic
fluid. The fetus reabsorbs
some of this fluid after
swallowing it.

A

9th and 12th
weeks

21
Q

Slow eye
movements occur at which week?

A

14 weeks (3.5 month)

22
Q

By ……….weeks, the
ovaries are
differentiated and
contain primordial
ovarian follicles that
have oogonia
(primordial germ
cells)

A

16

23
Q

Fetal movements—
quickening—are
commonly felt by the
mother during which period?

A

17-20 weeks

24
Q

during which period is the skin of the embryo
covered with a greasy
material—vernix
caseosa
. (It consists of
dead epidermal cells
and a fatty secretion
from the fetal
sebaceous glands.)

A

17-20 weeks

25
Q

Brown fat forms
during weeks ………and is
the site of heat
production,
particularly in the
neonate.( produces
heat by oxidizing
fatty acids.)

A

17 to 20

26
Q

when does the
fetal uterus
formation and
canalization of
the vagina begins?

A

18th week

27
Q

when does the testes
begin to
descend?

A

20 week

28
Q

At 21 weeks ………..

A

rapid eye movements begin

29
Q

Fingernails are present by

A

24 weeks.

30
Q

when does the secretion of surfactants(from type II pneumocytes in the
interalveolar walls of the lung ) begin?

A

24 weeks

31
Q

during which period does the
fetus usually survive if
born prematurely?

A

26-29 weeks (bcz during this period the lungs have
developed sufficiently to
provide adequate gas
exchange.)

32
Q

at 30 weeks :

A

The pupillary light reflex of the eyes can be elicited