highlights of fetal period Flashcards
……….produces a large ventral
prominence and pumps
blood
The early heart
the
neural tube is open at
the rostral and caudal
…………….
neuropores
At 26 days, the ………….produces a
prominent elevation of the head and the
long, curved caudal eminence (tail-like
structure) is present.
forebrain
At 26 days, the ………. (primordia of
internal ears) are also visible.
otic pits
Ectodermal thickenings called …………., indicating the future lenses of
the eyes, are visible on the sides of the
head.
lens
placodes
At 28 days, which limb buds are
recognizable as small swellings on the
ventrolateral body walls?
upper limb buds
which structures are recognizable by the end of the fourth week?
-The fourth pair of pharyngeal arches and the lower limb buds
-the caudal neuropore is usually closed.
-cardiovascular system is established
when does the Growth of the head
exceeds that of other
regions?
during fifth week
The mesonephric ridges
indicate the site of the
mesonephric kidney
which are the primordia
of the permanent
kidneys during which week?
fifth week
when does the embryo show
reflex
responses to touch and spontaneous movements, such as
twitching of the trunk and limbs?
during Sixth Week
when do the digital rays(primordia of the digits (fingers)) —begin to develop in
the hand plates?
during Sixth Week
when do the —auricular
hillocks—develop and contribute to
the formation of the auricle of the
external ear?
during Sixth Week
when does the umbilical herniation occur?
during the sixth ween
Communication
between the primordial
gut and the umbilical
vesicle is
…………..
omphaloenteric duct.
when do Notches appear
between the digital rays
in the hand plates (to separate the future fingers)?
during the seventh week