Ectodermal deriviatives

Which germ layer gives rise to the epithelial lining of the gastrointestinal tract?

gastrointestinal tract

What three sections is the gut tube divided into during development?

fore, mid and hindgut

What is the role of the oropharyngeal membrane(=ectodermal-endodermal membrane)?

It separates the stomodeum (oral cavity) formed by ectoderm from the pharynx formed by endoderm

How is the oral cavity eventually connected to the primitive gut

by ruptering of the oropharyngeal membrane

what connect ths midgut to the yolk sac

vitelline duct (eerst wide, with development becomes narrow and long, en later verdwijnt ie bijna, becomes very thin)

what is the function of the cloacal membrane during development

It separates the endoderm-derived upper anal canal from the ectoderm-derived lower proctodeum

Which epithelial linings are formed by the endoderm outside the gut system?

• respiratory tract

• urinary bladder

• urethra

• tympanic cavity

• auditory tube

What structural change allows more endoderm to be incorporated into the embryo to form the gut tube?

cephalocaudal folding and lateral body wall folding

for what structures does the endooderm form the parenchyma

• thyroid

• parathyroid

• liver

• pancreas

the gastrointestinal tract forms the

roof of the yolk sac

what is the ventral wall defect

failure of the lateral body walls to close

where are cloaca formed

allantois