Nervous System
Questions
DIRECTIONS: Each item below contains a question or incomplete
statement followed by suggested responses. Select the one bestresponse to
each question.134.A 4-year-old boy is referred to the pediatric neurology clinic. His
behavior is described as: difficulty in expressing needs, using gestures
instead of words and repeating words in place of normal, responsive lan-
guage. In the examination room he wanders around repeatedly singing
“Baa Baa Black Sheep,” then crying and laughing for no apparent reason.
His parents say he is nervous, excitable, “will not cuddle or be cuddled”
and hyperactive. He has no apparent fear of danger and a constant need to
spin objects and jumps while twiddling his fingers. MRI showed a signifi-
cant reduction in total grey matter volume with localized grey matter
reductions within fronto-striatal, parietal, and ventral and superior tempo-
ral grey matter. FMRI showed an abnormal activation pattern in cortical as
well as limbic/striatal areas. The neurons in the frontal, parietal and tem-
poral cortex originate from which region embryologically?
a. subventricular zone
b. marginal zone
c. intermediate zone
d. mantle zone
e. sulcus limitans135.The action potential in the neuron results from which of the following?
a. Hyperpolarization
b. The opening of K+channels
c. The opening of Na+channels
d. Inward flux of K+
e. Pumping of Na+from the neuron229Copyright © 2007 by The McGraw-Hill Companies, Inc. Click here for terms of use.