Embryology 2.3

Question 1

Describe the organogenetic period? (weeks 4-8)

Answer 1

it is here that the foundations are laid for the brain and the spinal cord, cardiovascular system and the heart, the gut, urogenital system and further development of the somites into limb buds and structures that form the neck

Question 2

What does the intermediate plate mesoderm become?

Answer 2

urogenital system (kidneys and repro)

Question 3

What does lateral plate mesoderm become?

Answer 3

body cavity and coverings

Question 4

What will happen because the mesoderm is getting really heavy?

Answer 4

the trilaminar embryo folded and we got a tube where the ectoderm on the surface , mesoderm in between the two layers and the endoderm being the innermost structure of the tube.

Question 5

What are the three primary germ layers in embryonic development, and what structures do they form?

Answer 5

One end is head end and the other end of yellow tube is the tail end (forms your gut).

Mesoderm form a lot of structures that sit inside the body

Ectoderm on surface forms the skin that covers the entire embryo and neural tube.

Endoderm forms gut and respiratory

Question 6

What happens to cavities once the tube has formed?

Answer 6

amniotic cavity covers entire embryo

yolk sac is below the endodermal layer- part of it is part-inside or sequestered into this endodermal tube or gut tube. Space of the gut tube through which your food passes is actually part of your yolk sac.

Question 7

Describe the lateral folding of the embryo?

Answer 7

both lateral ends of ectoderm, mesoderm and endoderm join

lateral plate mesoderm then develops two layers
-one that covers gut tube (somatic mesoderm)
-one thats just inside of the ectoderm (splanchnic mesoderm)
and in middle there is just a space

Question 8

What is the lateral plate mesoderm going to go on and form?

Answer 8

going to form the coverings of the respiratory tube and the gut tube.
The pleura and peritoneum and space between them will form body cavity.

Question 9

What happens during the head and tail fold?

Answer 9

brain developing from head end and urogenital system forming and folding.

Question 10

What does ectoderm form?

Answer 10

epidermis of skin
neural tube

Question 11

What do the parts of the mesoderm form?

Answer 11

paraxial mesoderm:
dermatome- dermis of skin
myotome- muscles
sclerotome- bones

intermediate:
urogenital system
(kidneys, reproductive)

lateral plate mesoderm
-peritoneum , pleura and body cavities

Endoderm
-gut
-respiratory