mesoderm

Question 1

how does mesoderm expand?

Answer 1

between newly forming ectoderm and endoderm

Question 2

wherre is mesoderm positioned?

Answer 2

between epiblasts and endoblasts in all regions, except at two poles where mouth and anus will form.

Question 3

in what direction does mesoderm form specialized regions?

Answer 3

from medial region to lateral

Question 4

notochord

Answer 4

mesoderm forms notochord at the midline. will induce formation of CNS

Question 5

how does notochord form?

Answer 5

between days 16 and 22. ventral wall of notochordal process has begun to fuse with endoderm to form notochord plate. this processes starts at caudal end of notochordal process and proceeds cranially. an open neurenteric canal is briefly created between the amniotic cavity and yolk sac cavity.

Question 6

what is induction?

Answer 6

one tissue develops and stimulates creation of another tissue

Question 7

where are endoderm and ectoderm fused?

Answer 7

at buccopharyngeal and cloacal membranes