When Responding to Stimulation of the Outer Margin of the Sole

question 125

Multiple Choice

When responding to stimulation of the outer margin of the sole of the foot,a 1-year-old infant extends her great toe without fanning of the other toes.This happens because:

• A) the corticospinal fibers have become fully myelinated and the Babinski reflex becomes suppressed.
• B) the corticospinal fibers have not yet become fully myelinated and the Babinski reflex is activated.
• C) the sensory fibers in the ophthalmic branch of the fifth cranial nerve are mediated by reflex arcs.
• D) a deep reflex is mediated by a two-neuron spinal arc.

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