A neuroscientist analyzes the central nervous system of a 5-week-old human embryo.She is MOST likely to observe:
A)only a neural tube.
B)the beginnings of forebrain and hindbrain development.
C)the major subdivisions of the hindbrain but not the forebrain.
D)the major subdivisions of the forebrain but not the hindbrain.

Question

Quizplus · Accepted Answer

At 5 weeks of development, the embryo has gone through neurulation and has formed the neural tube, which will eventually develop into the brain and spinal cord. The forebrain and hindbrain are already beginning to form at this stage, but the subdivisions of each region are not yet distinguishable. Therefore, option B is the most likely observation for the neuroscientist.

A Neuroscientist Analyzes the Central Nervous System of a 5-Week-Old