Respiratory System 9- Development Of The Respiratory System

Front 1

what day is the 16 stage cell stage reached

Back 1

by end of day 3

Front 2

which cells give rise to foetal placenta and what day

Back 2

trophoblast cells by day 5

Front 3

which type of cells give rise to the embryo

Back 3

inner mass cells

Front 4

by day 8 the cell mass differentiates into 2 what layers

Back 4

1. hypoblast (primative endoderm)

2. epiblast (primative ectoderm

Front 5

what is the difference between pluripotent and totipotent cells

Back 5

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

Front 6

by what day is 16-stage cell reached

Back 6

end of day 3

Front 7

which stage-cells holds totipotent cells

Back 7

4 and 8

Front 8

what's formed at day 5

Back 8

blastocyst which consits of an inner cell mass and trophoblast

Front 9

which cells give rise to the placenta

Back 9

trophoblasts

Front 10

which cells develop into the embryo

Back 10

inner cell mass

Front 11

day 6

Back 11

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.

Front 12

what happens on day 8

Back 12

cell mass differentiates into 2 distinctive layers :

1) The hypoblast or primative endoderm

2) The epiblast, or the primative ectoderm

Front 13

which two layers form the bilamiar embryonic disc

Back 13

hypo and epiblast

Front 14

in what layer does the amniotic cavity form

Back 14

epiblast

Front 15

which cells from the exocoelic membrane and how

Back 15

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

Front 16

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

Back 16

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

Front 17

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

Back 17

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

Front 18

whats a key developmental point in week 3

Back 18

gastrulation

Front 19

what happens in gastrulation

Back 19

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

Front 20

what does the ectoderm give rise to ?

Back 20

the skin and nervous system

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

Front 21

what does the mesoderm give rise to

Back 21

muscle and bone

(m for muscle)

Front 22

what does the endoderm give rise to ?

Back 22

eepithelial lining of the GI tract and many organs

e for epithelial

Front 23

what day does gastrulation start ?

Back 23

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

Front 24

whats a primitive streak?

Back 24

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.

Front 25

what happens after the formation of the primitive streak

Back 25

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

Front 26

what happens to mesodermal cells day 16

Back 26

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

Front 27

where does the oropharyngeal membrane form in week 3 ?

Back 27

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.

Front 28

in week 4 the oropharyngeal breaks down to form what ?

Back 28

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

Front 29

what does the cloacal membrane break down to form

Back 29

openings of the anal, urinary and reproductive parts

Front 30

in what week does embryo undergo embryoninc folding

Back 30

4

Front 31

why does folding arise

Back 31

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.

Front 32

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

Back 32

the foregut, the midgut and the hindgut.