A mother of a 1-month-old infant asks the nurse why it takes so long for infants to learn to roll over. The nurse knows that the reason for this is:
a. A demyelinating process must be occurring with her infant.
b. Myelin is needed to conduct the impulses, and the neurons of a newborn are not yet myelinated.
c. The cerebral cortex is not fully developed; therefore, control over motor function gradually occurs.
d. The spinal cord is controlling the movement because the cerebellum is not yet fully developed.
ANS: B
The infant's sensory and motor development proceeds along with the gradual acquisition of myelin, which is needed to conduct most impulses. Very little cortical control exists, and the neurons are not yet myelinated. The other responses are not correct.
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