Which of the following are paired structures that fuse to be

Which of the following are paired structures that fuse to become a single trans-segmental structure?

Neural folds

Dorsal aorta

Notochord

Foregut, midgut, and hindgut

First two choices

Solution

Answer: E. first two choices

Reason:

The major morphological relations in the evolution of vertebrate animal life (at the phylum level & domain level) from invertebrates (from four -limb species): The major features of embryonic vertebrate zygote formation & followed by eight-cell stage of embryo finally blastula stage and gastrulation. Neural folds are developed from the embryonic germinal layer “ectoderm” to form neuroepithelium finally generates notochord by paired “neural folds” structures that fuse to become a single trans-segmental structure, which is a continuous hollow structures (in birds & chicken embryo). The other structures “aortic arches” are mainly branching off to form transsegmental structure and this is going to takes place on the dorsal sides of gills in chicken embryo development to reattach again to from single continuous trans-segmental dorsal aortae, an evolutionary aspect of embryonic development