highlights of fetal period

Question 1

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

Answer 1

The early heart

Question 2

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

Answer 2

neuropores

Question 3

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

Answer 3

forebrain

Question 4

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

Answer 4

otic pits

Question 5

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

Answer 5

lens
placodes

Question 6

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

Answer 6

upper limb buds

Question 7

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

Answer 7

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

Question 8

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

Answer 8

during fifth week

Question 9

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

Answer 9

fifth week

Question 10

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

Answer 10

during Sixth Week

Question 11

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

Answer 11

during Sixth Week

Question 12

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

Answer 12

during Sixth Week

Question 13

when does the umbilical herniation occur?

Answer 13

during the sixth ween

Question 14

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

Answer 14

omphaloenteric duct.

Question 15

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

Answer 15

during the seventh week

Question 16

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

Answer 16

during the eighth week

Question 17

Coordinated limb
movements first occur during which week

Answer 17

during the eighth week

Question 18

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

Answer 18

At the end of the eighth week

Question 19

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

Answer 19

12th week.

Question 20

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.

Answer 20

9th and 12th
weeks

Question 21

Slow eye
movements occur at which week?

Answer 21

14 weeks (3.5 month)

Question 22

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

Answer 22

16

Question 23

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

Answer 23

17-20 weeks

Question 24

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.)

Answer 24

17-20 weeks

Question 25

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

Answer 25

17 to 20

Question 26

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

Answer 26

18th week

Question 27

when does the testes
begin to
descend?

Answer 27

20 week

Question 28

At 21 weeks ………..

Answer 28

rapid eye movements begin

Question 29

Fingernails are present by

Answer 29

24 weeks.

Question 30

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

Answer 30

24 weeks

Question 31

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

Answer 31

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

Question 32

at 30 weeks :

Answer 32

The pupillary light reflex of the eyes can be elicited