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[BIO 170.02] DevBio LAB
LT 2
Chick Embryo
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Created by
RANDY RUEL
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Cards (29)
Living part of the chicken egg
Blastoderm
The blastoderm is surrounded by the
area
pellucida
and
area
opaca
Transparent portion of the embryo
Area pellucida
Darker portion of the embryo, where extra embryonic blood vessels are forming
Area opaca
The
primitive
streak
is a
clear
line flanked by parallel
dark
lines toward the center of the area
pellucida
Groove between 2 primitive folds
Primitive groove
2 ectodermal elevations
Primitive folds
Deep anterior pit where groove terminates
Hensen's node
The
notochord
is a slightly
darkened
triangular area anterior to the
Hensen's node
Formed throughout the area opaca, irregularly shaped accumulations of mesodermal cells
Blood islands
Will form the blood vessels and primitive blood cells
Blood islands
In how many hours will the somites be present?
~
21
In this stage, the specimen is divisible into an inner area pellucida and an outer area opaca
33
Hour Chick Embryo
Clear area anterior to the head of the embryo
Proamnion
Biggest difference between 48 hour and 33 hour chick embryo
Cephalic flexure
In the
48
hour chick embryo, there are now optic cups and about
20
to
28
somites
After 72 hours, the chick embryo will now have:
Limb
buds
Tail
Paired
wing
Sac-like
allantois
The
allantois
acts as an embryonic
lung
Day 1
Head
fold
formation
Hensen's
node
regression
Separation of embryo from
extraembryonic
tissue
Day 2
Blood
islands
Heart primordium
Closing of
neural tube
Day 3
Start of
blood circulation
Appearance of
extraembryonic fold
Day 4
Limb bud
and
allantoic vesicle
formation
Day 9
C-shaped
embryo
Appearance of
claws
Budding of
first
feather
follicles
The ff image shows the
blastodisc
:
Single reproductive cell
Blastodisc
Four membranes of the amniotic egg:
Chorion
Amnion
Yolk
sac
Allantois
Encases the embryo in a fluid-filled cavity
Amnion
Blood vessel formation is attributed to:
Vasculogenesis
Angiogenesis
Branch point density =
branch
points
in a blood vessel segment /
length
of a blood vessel segment
Distance between each branch point
Intercapillary distance