Imagine looking at a slide containing a cross section of a frog embryo that has just completed neurulation.If you begin your examination at the dorsal surface of the embryo and moved inward, you will see, in sequence,
A) epidermis, notochord, neural tube, and gut.
B) epidermis, neural tube, gut, and notochord.
C) neural tube, epidermis, notochord, and gut.
D) epidermis, neural tube, notochord, and gut.
E) notochord, neural tube, gut, and epidermis.

Question

Quizplus · Accepted Answer

The typical cross section of a frog embryo after neurulation shows the epidermis on the outermost layer, followed by the neural tube, notochord, and gut. Therefore, as one moves inward from the dorsal surface, the correct sequence would be epidermis, neural tube, notochord, and gut, which is only matched by choice (D).

Imagine Looking at a Slide Containing a Cross Section of a Frog