gastrulation and primative streak

Question 1

where is the primitive streak found and what are the 3 parts of it

Answer 1

found on the epiblast layer of the embryo
3 parts = primitive pit, node and groove
with the primitive pit and node at the cranial end

Question 2

what is gastrulation and what does it form

Answer 2

gastrulation is the movement of the epiblast cells through the primitive streak and in between the 2 existing germ layers, forming 3 primary germ layers

Question 3

what 3 primary germ layers are formed following gastrulation

Answer 3

ectoderm, mesoderm and endoderm

Question 4

what major tissue is derived from the ectoderm germ layer

Answer 4

epidermis of skin (hair, nails, glands)
nervous system (brain, spinal cord, peripheral nerves)

Question 5

what major tissues are derived from the mesoderm

Answer 5

skeletal and smooth muscle
cardiovascular system
urogenital systems (kidneys, ureter, gonads etc.)

Question 6

what major tissues are derived from the endoderm

Answer 6

lining of: gut tube, respiratory tract, bladder + urethra