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32 Cards in this Set

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what day is the 16 stage cell stage reached

by end of day 3

which cells give rise to foetal placenta and what day

trophoblast cells by day 5

which type of cells give rise to the embryo

inner mass cells

inner mass cells

by day 8 the cell mass differentiates into 2 what layers

1. hypoblast (primative endoderm)
2. epiblast (primative ectoderm

1. hypoblast (primative endoderm)


2. epiblast (primative ectoderm

what is the difference between pluripotent and totipotent cells

totipotent cells can give rise an entire human being- cells that occur in early embryonic division


pluripotent cells can give rise to all cells of the human body- derived from inner cell mass

by what day is 16-stage cell reached

end of day 3

which stage-cells holds totipotent cells

4 and 8

what's formed at day 5

blastocyst which consits of an inner cell mass and trophoblast

blastocyst which consits of an inner cell mass and trophoblast

which cells give rise to the placenta

trophoblasts

which cells develop into the embryo

inner cell mass

day 6

Implantation - inner cell mass orientated to the uterine endometrium. The endrometrial gland enlarge and the endometrium, now known as the decidua becomes more heavily vascularised.

what happens on day 8

cell mass differentiates into 2 distinctive layers :
1) The hypoblast or primative endoderm
2) The epiblast, or the primative ectoderm

cell mass differentiates into 2 distinctive layers :


1) The hypoblast or primative endoderm


2) The epiblast, or the primative ectoderm

which two layers form the bilamiar embryonic disc

hypo and epiblast

in what layer does the amniotic cavity form

epiblast

which cells from the exocoelic membrane and how

the hypoblast migrate and flatten and form the exocoelic membrane around the inner surface of blastocyst by day 9.

the hypoblast migrate and flatten and form the exocoelic membrane around the inner surface of blastocyst by day 9.

what happens at the same time as the formtion of the exocoelomic membrane

the extention of the amnion cavity which surround the entire embryo forming the mbryonic cavity

the extention of the amnion cavity which surround the entire embryo forming the mbryonic cavity

what happens to the embryonic positioned between amniotic cavity and yolk sac in week 4

-cells in yolk sac develop into gonads and yolk sac develops into parts of the GI tract

whats a key developmental point in week 3

gastrulation

what happens in gastrulation

Bilaminar disc develops into trilaminar structure, made of three primary germ layers

what does the ectoderm give rise to ?

the skin and nervous system



(ect- sounds like exo so outside is skin , skin is sentive (nervous system)

what does the mesoderm give rise to

muscle and bone


(m for muscle)

what does the endoderm give rise to ?

eepithelial lining of the GI tract and many organs



e for epithelial

what day does gastrulation start ?

day 15 with migration of cells from epiblast forming the primative streak.

whats a primitive streak?

roove on the dorsal surface of the epiblast that that extends from the posterior (tail region) to the anterior (node) region of the bilaminar disk.

roove on the dorsal surface of the epiblast that that extends from the posterior (tail region) to the anterior (node) region of the bilaminar disk.

what happens after the formation of the primitive streak

After the formation of the primitive disk, epiblast cells migrate inwards below the primitive streak, some of which displace the hypoblast to form the endoderm, whilst other cells form the mesoderm The cells of the epiblast then form the ectoderm

what happens to mesodermal cells day 16

Day 16 mesodermal cells from the node migrate towards the head region of the embryo to hollow tube notochordal process, which then develops into turn the solid notochord

where does the oropharyngeal membrane form in week 3 ?

forms on the dorsal surface of the anterior region of the embryo, and the cloacal membrane forms on the dorsal surface of the posterior (tail) region of the embryo.

in week 4 the oropharyngeal breaks down to form what ?

to connect the oral cavity (mouth) to the pharynx and the GI trac

what does the cloacal membrane break down to form

openings of the anal, urinary and reproductive parts

in what week does embryo undergo embryoninc folding

4

why does folding arise

Folding arises because of unequal growth rates of different parts of the embryo. Folding in the medial plane gives rise to the head and the tail, whilst lateral folds give rise to the coelom and pinches off the yolk sac, giving rise to the primitive gut.

The primitive gut consists of three main regions, what are they

the foregut, the midgut and the hindgut.