At 18 days after conception, this structure becomes visible in ...

[futuristic]

At 18 days after conception, this structure becomes visible in the developing embryo; it is the neural
 
  A) mesoderm.
  B) tube.
  C) plate.
  D) floor.
  E) crest.

Question 2

By 40 days after conception, three swellings become visible at the anterior end of the human neural tube. The most anterior of these swellings eventually develops into the
 
  A) brain.
  B) midbrain.
  C) hindbrain.
  D) forebrain.
  E) ventricles.

[zoeyesther]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: D